php+plupload+sortable实现多图上传 大视频分片上传、断点续传、缩略图排序_plupload 上传视频

最近在研究做一个多图上传，大视频上传、支持断点续传的功能，发现plupload插件比较符合要求，于是进行了简单研究，有什么不对的地方还望大家指正（新手，第一次写博客。。。）。
主要使用plupload插件（plupload.full.min.js、jquery.plupload.queue.js、jquery.plupload.queue.css、zh_CN.js）、以及Sortable.js插件

效果❤：
1.

4.

1.页面部分

引入css js

<link rel="stylesheet" type="text/css" href="/js/plupload-2.3.6/js/jquery.plupload.queue/css/jquery.plupload.queue.css">
    <script src="/js/jquery.min.js"></script>
    <script src="/js/plupload/plupload.full.min.js"></script>
    <script src="/js/plupload-2.3.6/js/jquery.plupload.queue/jquery.plupload.queue.js"></script>
    <script src="/js/plupload-2.3.6/js/i18n/zh_CN.js"></script>
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1.1上传成功后缩略图展示部分样式

<style>
       
    

#pic-list {
        list-style-type: none;
        /*position: absolute;*/
        border: 2px solid #767997;
        padding: 5px;
        display: none;
        width: 315px;
        overflow: hidden;
        /*margin-bottom: 100px;*/
    }
    #pic-list #triangle {
        border: 10px solid #767997;
        border-color: transparent transparent #767997 transparent;
        position: absolute;
        top: -20px;
        left: 5px;
    }
    #pic-list #title {
        padding-bottom: 5px;
    }
    #pic-list #title span {
        font-weight: bold;
    }
    #pic-list #title b {
        float: right;
    }
        #pic-list #title b:hover {
            color: #434664;
        }
        #pic-list #title #hint {
            color: #434664;
            font-size: .7em;
            padding-top: .7em;
        }
        #pic-list li {
            position: relative;
            display: inline-block;
            float: left;
            margin: 5px 5px 0px 0px;
            font-size: 0px; /* 解决换行间隙问题 */
            cursor: move;
        }
        #pic-list li#addBtn {
            box-sizing: border-box;
            width: 100px;
            /*height: 100px;*/
            height: 75px;
            /*line-height: 90px;*/
            line-height: 60px;
            border: 2px dashed #CCC;
            color: #CCC;
            font-size: 80px;
            text-align: center;
            padding-bottom: 30px;
        }
        #pic-list li img {
            box-sizing: border-box;
            width: 100px;
            /*height: 100px;*/
            height: 75px;
            border: 2px dashed #CCC;
        }
        #pic-list li:not(#addBtn):hover {
            filter: alpha(Opacity=50);
            -moz-opacity: 0.5;
            opacity: 0.5;
        }
        #pic-list li#addBtn:hover {
            border-color: #767997;
            color: #767997;
        }
        #pic-list li b{
            display: none;
            position: absolute;
            right: 0px;
            top: 0px;
            color: black;
            font-size: 15px;
            text-align: center;
            cursor: pointer;
        }
        #title b{
            cursor: pointer;
        }
        #pic-list li:not(#addBtn):hover b {
            display: block;
            width: 20px;
            height: 20px;
        }
        #pic-list li:not(#addBtn):hover b:hover {
            background-color: #808080;
        }
      
        #hit{
            height: 18px;
        }
    </style>
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1.2html页面核心部分

<div id="uploader">
    <p>Your browser doesn't have Flash, Silverlight or HTML5 support.</p>
</div>
<button id="toStop">暂停</button>
<button id="toStart">续传</button>
<!--缩略图展示部分-->
<div>
<ul id="pic-list" style="margin-top: 10px;">
    <span id="triangle"></span>
    <div id="title">
        <b onclick="delall()">X</b>
        <div id="hit"></div>
    </div>
</ul>
</div>
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1.3 js部分

<script type="text/javascript">
        $(function() {
            // Initialize the widget when the DOM is ready
            var uploader = $("#uploader").pluploadQueue({
                // General settings
                runtimes: 'html5,flash,silverlight,html4',
                url: "/admin/chunkUpload",//这里替换为你的路径

                // Maximum file size
                max_file_size: '10000mb',

                chunk_size: '20mb',                
                
                // Specify what files to browse for
                filters: [
                    {title: "Image files", extensions: "jpg,gif,png"},
                    {title: "Vedio files", extensions: "mp4,mkv"},
                    {title: "Zip files", extensions: "zip,avi"}
                ],

                // Rename files by clicking on their titles  通过点击文件标题 对文件进行重命名（文件上传前，可以点击文件名称重新编辑文件名）
                rename: true,

                // Sort files
                sortable: true,

                // Enable ability to drag'n'drop files onto the widget (currently only HTML5 supports that)
                dragdrop: true,

                // Views to activate
                views: {
                    list: true,
                    thumbs: true, // Show thumbs
                    active: 'thumbs'
                },

                // Flash settings
                flash_swf_url: 'js/Moxie.swf',

                // Silverlight settings
                silverlight_xap_url: 'js/Moxie.xap'
            });

            uploader.bind('FileUploaded', function(up, file, rt) {
                var data = JSON.parse(rt.response);
              
                if(data.error==0){
                    $('#pic-list').show();
                    var url = data.info.path.replace('./','');
                    //判断是图片还是视频
                    //获取最后一个/的位置
                    var site = url.lastIndexOf(".");
                    //截取最后一个/后的值
                   var tp = url.substring(site + 1, url.length).toLowerCase();
                   var imgarr=['jpg','gif','png'];
                   var videoarr=['mp4','mkv'];
                  if(imgarr.indexOf(tp) > -1){//则包含该元素}){
                      //图片
                    var onepic = '<li><img src="这里替换为你的域名/'+url+'"><b onclick="delimg(this,false)">x</b><input type="hidden" name="" value="这里替换为你的域名/'+url+'"></li>';
                    //$('#title').after(onepic);
                    $('#pic-list').append(onepic);

                  }
                  if(videoarr.indexOf(tp) > -1){

                    //视频
                    var oneVideo='<li><video id="video-div" controls="controls" style="margin-top: 10px;max-width: 400px;width: 100%;max-height:300px;">' +
                        '                        <source src="这里替换为你的域名'+url+'" type="video/mp4" id="video">\n' +
                        '                    </video><b onclick="delimg(this,false)">x</b></li>';
                    //$('#title').after(oneVideo);
                      $('#pic-list').append(oneVideo);
                  }


                    uploader.refresh(); // 重新渲染DOM，避免在添加按钮原位置仍会响应打开文件夹
                }
                else{
                    alert("出错了");
                }
            });


            //当上传队列中某一个文件开始上传后触发。
            uploader.bind('BeforeUpload', function(uploader, file){
                console.log('文件开始上传了');
                //console.dir(file);
            });

            //当使用文件小片上传功能时，每一个小片上传完成后触发
            uploader.bind('ChunkUploaded', function(uploader,file,responseObject){
                console.log('-----当文件上传分片的时候打印 开始----');
                //console.dir(JSON.parse(responseObject['response']));
                console.log('-----当文件上传分片的时候打印 结束---');
            });


            $("#toStop").on('click', function () {
                uploader.stop();
            });

            $("#toStart").on('click', function () {
                uploader.start();
            });
        
        });

        //单张图片删除
        function delimg(o,isConfirm) {
            if(!isConfirm){
                if(confirm("图片删除后不可恢复,确定删除?")) {
                    console.log("delete");
                    var tgname = $(o).prev()[0].tagName
                    console.log($(o).prev()[0].tagName);
                    var src = '';
                    if(tgname == 'IMG'){
                        src =$(o).prev().attr("src");
                    }else{
                        src =$(o).prev().children().attr('src');
                    }

                    delurl = src.substring(18);//注意：此处的imgurl需要根据实际情况修改，需要减去网址域名部分，剩余部门作为参数传递
                    //删除图片路径
                    //imgpath.splice($.inArray(delurl, imgpath), 1);
                    $.post('/admin/uploadImage?get=delimg&imgurl=' + delurl, function (data) {
                        /*optional stuff to do after success */
                        console.log(data);
                        if (data == 1) {
                            if ($("#pic-list").children("li").length == 10) {
                                $("#addBtn").css("display", "block");
                            }
                            $(o).parent().remove();
                          
                        }
                        else {
                            console.log(data);
                        }
                    });
                }
            }else{
                console.log("delete all");
                // /var src = $(o).prev().attr("src");
                var tgname = $(o).prev()[0].tagName
                console.log($(o).prev()[0].tagName);
                var src = '';
                if(tgname == 'IMG'){
                    src =$(o).prev().attr("src");
                }else{
                    src =$(o).prev().children().attr('src');
                }
                delurl = src.substring(18);//注意：此处的imgurl需要根据实际情况修改，需要减去网址域名部分，剩余部门作为参数传递
                //删除图片路径
                imgpath=[];
                $.post('/admin/uploadImage?get=delimg&imgurl=' + delurl, function (data) {
                    /*optional stuff to do after success */
                    console.log(data);
                    if (data == 1) {
                        if ($("#pic-list").children("li").length == 10) {
                            $("#addBtn").css("display", "block");
                        }
                        $(o).parent().remove();
                     
                    }
                    else {
                        console.log(data);
                    }
                });
            }
        }
        // 图片全部删除
        function delall() {
            if(confirm("图片删除后不可恢复,确定删除?")) {
                $("#pic-list").hide();
                $("#pic-list li").children("b").each(function (index, el) {
                    delimg(el,true);
                });
            }

            //显示添加 上传按钮
            $('.plupload_buttons').show();
            $('.plupload_upload_status').hide();
            $('.plupload_total_file_size').html('0 b');
            $('.plupload_total_status').html('0%');
            $('.plupload_upload_status').html('');


        }
        
</script>
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2.后台PHP代码

//图片视频上传

    function chunkUpload()
    {
		//封装好的plupload文件上传类，直接使用即可
        require_once __DIR__.'/PluploadHandler.php';

        $ph = new PluploadHandler(array(
            'target_dir' => './uploads/',//上传路径
            'allow_extensions' => 'jpg,jpeg,png,gif,mp4,mov,mkv,zip,avi',//允许上传格式
        ));

        $ph->sendNoCacheHeaders();
        $ph->sendCORSHeaders();

        if ($result = $ph->handleUpload()) {
			//图片上传路径 需做简单修改，这个可以打印出来自己看就明白了
            $result['path']=str_replace('\\','/',$result['path']);            
            die(json_encode(array(
                'error' => 0,
                'info' => $result
            )));
        } else {
            die(json_encode(array(
                'error' => 1,
                'error' => array(
                    'code' => $ph->getErrorCode(),
                    'message' => $ph->getErrorMessage()
                )
            )));
        }
    }
	
	//视频图片删除
    function uploadImage()
    {
        if ($_GET['get'] == 'delimg') {
            $imgsrc = $_GET['imgurl'];
            unlink($imgsrc);
            echo 1;
        }
    }
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另：这里把封装好的PluploadHandler.php代码贴出来

<?php


define('PLUPLOAD_MOVE_ERR', 103);
define('PLUPLOAD_INPUT_ERR', 101);
define('PLUPLOAD_OUTPUT_ERR', 102);
define('PLUPLOAD_TMPDIR_ERR', 100);
define('PLUPLOAD_TYPE_ERR', 104);
define('PLUPLOAD_UNKNOWN_ERR', 111);
define('PLUPLOAD_SECURITY_ERR', 105);

define('DS', DIRECTORY_SEPARATOR);

///**
// * Public interface:
// * @method void handleUpload(array $conf)
// * @method string combineChunksFor(string $file_name)
// * @method int getFileSizeFor(string $file_name)
// * @method string getTargetPathFor(string $file_name)
// * @method void sendNoCacheHeaders()
// * @method void sendCorsHeaders()
// * @method int getErrorCode()
// * @method string getErrorMessage()
// *
// */
class PluploadHandler
{
    /**
     * @property array $conf
     */
    private $conf;

    /**
     * Resource containing the reference to the file that we will write to.
     * @property resource $out
     */
    private $out;

    /**
     * In case of the error, will contain error code.
     * @property int [$error=null]
     */
    protected $error = null;


    function __construct($conf = array())
    {
        $this->conf = array_merge(
            array(
                'file_data_name' => 'file',
                'tmp_dir' => ini_get("upload_tmp_dir") . DS . "plupload",
                'target_dir' => false,
                'cleanup' => true,
                'max_file_age' => 5 * 3600, // in hours
                'max_execution_time' => 5 * 60, // in seconds (5 minutes by default)
                'chunk' => isset($_REQUEST['chunk']) ? intval($_REQUEST['chunk']) : 0,
                'chunks' => isset($_REQUEST['chunks']) ? intval($_REQUEST['chunks']) : 0,
                'append_chunks_to_target' => true,
                'combine_chunks_on_complete' => true,
                'file_name' => isset($_REQUEST['name']) ? $_REQUEST['name'] : false,
                'allow_extensions' => false,
                'delay' => 0, // in seconds
                'cb_sanitize_file_name' => array($this, 'sanitize_file_name'),
                'cb_check_file' => false,
                'cb_filesize' => array($this, 'filesize'),
                'error_strings' => array(
                    PLUPLOAD_MOVE_ERR => "Failed to move uploaded file.",
                    PLUPLOAD_INPUT_ERR => "Failed to open input stream.",
                    PLUPLOAD_OUTPUT_ERR => "Failed to open output stream.",
                    PLUPLOAD_TMPDIR_ERR => "Failed to open temp directory.",
                    PLUPLOAD_TYPE_ERR => "File type not allowed.",
                    PLUPLOAD_UNKNOWN_ERR => "Failed due to unknown error.",
                    PLUPLOAD_SECURITY_ERR => "File didn't pass security check."
                ),
                'debug' => false,
                'log_path' => FCPATH."error.log"
            ),
            $conf
        );
    }


    function __destruct()
    {
        $this->reset();
    }


    function handleUpload()
    {
        $conf = $this->conf;

        @set_time_limit($conf['max_execution_time']);

        try {
            // Start fresh
            $this->reset();

            // Cleanup outdated temp files and folders
            if ($conf['cleanup']) {
                $this->cleanup();
            }

            // Fake network congestion
            if ($conf['delay']) {
                sleep($conf['delay']);
            }


            if (!$conf['file_name']) {
                if (!empty($_FILES)) {
                    $conf['file_name'] = $_FILES[$conf['file_data_name']]['name'];
                } else {
                    throw new Exception('', PLUPLOAD_INPUT_ERR);
                }
            }

            //add jxr 文件名 可能有中文 处理
//            $fname = $conf['file_name'];
//            $index = strripos($fname,".");//01.mp4  2
//            $tp = substr($fname,$index+1);
//            $name = substr($fname,0,$index);
//            $conf['file_name'] = md5($name).".".$tp;

            if (is_callable($conf['cb_sanitize_file_name'])) {
                $file_name = call_user_func($conf['cb_sanitize_file_name'], $conf['file_name']);
            } else {
                $file_name = $conf['file_name'];
            }


            // Check if file type is allowed
            if ($conf['allow_extensions']) {
                if (is_string($conf['allow_extensions'])) {
                    $conf['allow_extensions'] = preg_split('{\s*,\s*}', $conf['allow_extensions']);
                }

                if (!in_array(strtolower(pathinfo($file_name, PATHINFO_EXTENSION)), $conf['allow_extensions'])) {
                    throw new Exception('', PLUPLOAD_TYPE_ERR);
                }
            }

            $this->lockTheFile($file_name);

            $this->log("$file_name received" . ($conf['chunks'] ? ", chunks enabled: {$conf['chunk']} of {$conf['chunks']}" : ''));

            // Write file or chunk to appropriate temp location
            if ($conf['chunks']) {
                $result = $this->handleChunk($conf['chunk'], $file_name);
            } else {
                $result = $this->handleFile($file_name);
            }

            $this->unlockTheFile($file_name);
            return $result;
        } catch (Exception $ex) {
            $this->error = $ex->getCode();
            $this->log("ERROR: " . $this->getErrorMessage());
            $this->unlockTheFile($file_name);
            return false;
        }
    }


    /**
     * Retrieve the error code
     *
     * @return int Error code
     */
    function getErrorCode()
    {
        if (!$this->error) {
            return null;
        }

        if (!isset($this->conf['error_strings'][$this->error])) {
            return PLUPLOAD_UNKNOWN_ERR;
        }

        return $this->error;
    }


    /**
     * Retrieve the error message
     *
     * @return string Error message
     */
    function getErrorMessage()
    {
        if ($code = $this->getErrorCode()) {
            return $this->conf['error_strings'][$code];
        } else {
            return '';
        }
    }


    /**
     * Combine chunks for specified file name.
     *
     * @throws Exception In case of error generates exception with the corresponding code
     *
     * @param string $file_name
     * @return string Path to the target file
     */
    function combineChunksFor($file_name)
    {
        $file_path = $this->getTargetPathFor($file_name);
        if (!$tmp_path = $this->writeChunksToFile("$file_path.dir.part", "$file_path.part")) {
            return false;
        }
        return $this->rename($tmp_path, $file_path);
    }


    protected function handleChunk($chunk, $file_name)
    {
        $file_path = $this->getTargetPathFor($file_name);

        $this->log($this->conf['append_chunks_to_target']
            ? "chunks being appended directly to the target $file_path.part"
            : "standalone chunks being written to $file_path.dir.part"
        );

        if ($this->conf['append_chunks_to_target']) {
            $chunk_path = $this->writeUploadTo("$file_path.part", false, 'ab');

            if ($this->isLastChunk($file_name)) {
                return $this->rename($chunk_path, $file_path);
            }
        } else {
            $chunk_path = $this->writeUploadTo("$file_path.dir.part" . DS . "$chunk.part");

            if ($this->conf['combine_chunks_on_complete'] && $this->isLastChunk($file_name)) {
                return $this->combineChunksFor($file_name);
            }
        }

        return array(
            'name' => $file_name,
            'path' => $chunk_path,
            'chunk' => $chunk,
            'size' => call_user_func($this->conf['cb_filesize'], $chunk_path)
        );
    }


    protected function handleFile($file_name)
    {
        $file_path = $this->getTargetPathFor($file_name);
        $tmp_path = $this->writeUploadTo($file_path . ".part");
        return $this->rename($tmp_path, $file_path);
    }


    protected function rename($tmp_path, $file_path)
    {
        // Upload complete write a temp file to the final destination
        if (!$this->fileIsOK($tmp_path)) {
            if ($this->conf['cleanup']) {
                @unlink($tmp_path);
            }
            throw new Exception('', PLUPLOAD_SECURITY_ERR);
        }

        if (rename($tmp_path, $file_path)) {
            $this->log("$tmp_path successfully renamed to $file_path");

            //add jxr
            //$this->videoPress(str_replace('.\\','',$file_path), FCPATH . 'uploads/');//  .\uploads\01.mp4

            return array(
                'name' => basename($file_path),
                'path' => $file_path,
                'size' => call_user_func($this->conf['cb_filesize'], $file_path)
            );
        } else {
            return false;
        }
    }

    /**
     * Writes either a multipart/form-data message or a binary stream
     * to the specified file.
     *
     * @throws Exception In case of error generates exception with the corresponding code
     *
     * @param string $file_path The path to write the file to
     * @param string [$file_data_name='file'] The name of the multipart field
     * @return string Path to the target file
     */
    protected function writeUploadTo($file_path, $file_data_name = false, $mode = 'wb')
    {
        if (!$file_data_name) {
            $file_data_name = $this->conf['file_data_name'];
        }

        $base_dir = dirname($file_path);
        if (!file_exists($base_dir) && !@mkdir($base_dir, 0777, true)) {
            throw new Exception('', PLUPLOAD_TMPDIR_ERR);
        }

        if (!empty($_FILES)) {
            if (!isset($_FILES[$file_data_name]) || $_FILES[$file_data_name]["error"] || !is_uploaded_file($_FILES[$file_data_name]["tmp_name"])) {
                throw new Exception('', PLUPLOAD_INPUT_ERR);
            }
            return $this->writeToFile($_FILES[$file_data_name]["tmp_name"], $file_path, $mode);
        } else {
            return $this->writeToFile("php://input", $file_path, $mode);
        }
    }

    /**
     * Write source or set of sources to the specified target. Depending on the mode
     * sources will either overwrite the content in the target or will be appended to
     * the target
     * Create by: jxr
     * Date: 2019/8/1
     * Time: 15:13
     * @param $source_paths array|string
     * @param $target_path string
     * @param string $mode string [$mode='wb'] Mode to use (to append use 'ab')  a追加b以二进制形式写入文件末尾（追加）  wb已二进制形式写覆盖
     * @return mixed string Path to the written target file
     * @throws Exception
     */
    protected function writeToFile($source_paths, $target_path, $mode = 'wb')
    {
        if (!is_array($source_paths)) {
            $source_paths = array($source_paths);
        }

        if (!$out = @fopen($target_path, $mode)) {
            throw new Exception('', PLUPLOAD_OUTPUT_ERR);
        }

        foreach ($source_paths as $source_path) {
            if (!$in = @fopen($source_path, "rb")) {
                throw new Exception('', PLUPLOAD_INPUT_ERR);
            }

            while ($buff = fread($in, 4096)) {
                fwrite($out, $buff);
            }

            @fclose($in);

            $this->log("$source_path " . ($mode == 'wb' ? "written" : "appended") . " to $target_path");
        }

        fflush($out);
        @fclose($out);

        return $target_path;
    }


    /**
     * Combine chunks from the specified folder into the single file.
     *
     * @throws Exception In case of error generates exception with the corresponding code
     *
     * @param string $chunk_dir Directory containing the chunks
     * @param string $target_path The file to write the chunks to
     * @return string File path containing combined chunks
     */
    protected function writeChunksToFile($chunk_dir, $target_path)
    {
        $chunk_paths = array();

        for ($i = 0; $i < $this->conf['chunks']; $i++) {
            $chunk_path = $chunk_dir . DS . "$i.part";
            if (!file_exists($chunk_path)) {
                throw new Exception('', PLUPLOAD_MOVE_ERR);
            }
            $chunk_paths[] = $chunk_path;
        }

        $this->writeToFile($chunk_paths, $target_path, 'ab');

        $this->log("$chunk_dir combined into $target_path");

        // Cleanup
        if ($this->conf['cleanup']) {
            $this->rrmdir($chunk_dir);
        }

        return $target_path;
    }

    /**
     * Checks if currently processed chunk for the given filename is the last one.
     *
     * @param string $file_name
     * @return boolean
     */
    protected function isLastChunk($file_name)
    {
        if ($this->conf['append_chunks_to_target']) {
			if ($result = $this->conf['chunks'] && $this->conf['chunks'] == $this->conf['chunk'] + 1) {
				$this->log("last chunk received: {$this->conf['chunks']} out of {$this->conf['chunks']}");
			}
        } else {
            $file_path = $this->getTargetPathFor($file_name);
            $chunks = sizeof(glob("$file_path.dir.part/*.part"));
            if ($result = $chunks == $this->conf['chunks']) {
                $this->log("seems like last chunk ({$this->conf['chunk']}), 'cause there are $chunks out of {$this->conf['chunks']} *.part files in $file_path.dir.part.");
            }
        }

        return $result;
    }

    /**
     * Runs cb_check_file filter on the file if defined in config.
     *
     * @param string $file_path Path to the file to check
     * @return boolean
     */
    protected function fileIsOK($path)
    {
        return !is_callable($this->conf['cb_check_file']) || call_user_func($this->conf['cb_check_file'], $path);
    }


    /**
     * Returns the size of the file in bytes for the given filename. Filename will be resolved
     * against target_dir value defined in the config.
     *
     * @param string $file_name
     * @return number|false
     */
    function getFileSizeFor($file_name)
    {
        return call_user_func($this->conf['cb_filesize'], getTargetPathFor($file_name));
    }


    /**
     * Resolves given filename against target_dir value defined in the config.
     * 根据配置中定义的target_dir值解析给定文件名
     *
     * @param string $file_name
     * @return string Resolved file path
     */
    function getTargetPathFor($file_name)
    {
        $target_dir = str_replace(array("/", "\/"), DS, rtrim($this->conf['target_dir'], "/\\"));
        return $target_dir . DS . $file_name;
    }


    /**
     * Sends out headers that prevent caching of the output that is going to follow.
     */
    function sendNoCacheHeaders()
    {
        // Make sure this file is not cached (as it might happen on iOS devices, for example)
        header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
        header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
        header("Cache-Control: no-store, no-cache, must-revalidate");
        header("Cache-Control: post-check=0, pre-check=0", false);
        header("Pragma: no-cache");
    }

    /**
     * Handles CORS.
     *
     * @param array $headers Additional headers to send out
     * @param string [$origin='*'] Allowed origin
     */
    function sendCORSHeaders($headers = array(), $origin = '*')
    {
        $allow_origin_present = false;

        if (!empty($headers)) {
            foreach ($headers as $header => $value) {
                if (strtolower($header) == 'access-control-allow-origin') {
                    $allow_origin_present = true;
                }
                header("$header: $value");
            }
        }

        if ($origin && !$allow_origin_present) {
            header("Access-Control-Allow-Origin: $origin");
        }

        // other CORS headers if any...
        if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
            exit; // finish preflight CORS requests here
        }
    }


    /**
     * Cleans up outdated *.part files and directories inside target_dir.
     * Files are considered outdated if they are older than max_file_age hours.
     * (@see config options)
     */
    private function cleanup()
    {
        // Remove old temp files
        if (file_exists($this->conf['target_dir'])) {
            foreach (glob($this->conf['target_dir'] . '/*.part') as $tmpFile) {
                if (time() - filemtime($tmpFile) < $this->conf['max_file_age']) {
                    continue;
                }
                if (is_dir($tmpFile)) {
                    self::rrmdir($tmpFile);
                } else {
                    @unlink($tmpFile);
                }
            }
        }
    }


    /**
     * Sanitizes a filename replacing whitespace with dashes
     *
     * Removes special characters that are illegal in filenames on certain
     * operating systems and special characters requiring special escaping
     * to manipulate at the command line. Replaces spaces and consecutive
     * dashes with a single dash. Trim period, dash and underscore from beginning
     * and end of filename.
     *
     * @author WordPress
     *
     * @param string $filename The filename to be sanitized
     * @return string The sanitized filename
     */
    protected function sanitizeFileName($filename)
    {
        $special_chars = array("?", "[", "]", "/", "\\", "=", "<", ">", ":", ";", ",", "'", "\"", "&", "$", "#", "*", "(", ")", "|", "~", "`", "!", "{", "}");
        $filename = str_replace($special_chars, '', $filename);
        $filename = preg_replace('/[\s-]+/', '-', $filename);
        $filename = trim($filename, '.-_');
        return $filename;
    }


    /**
     * Concise way to recursively remove a directory
     * @see http://www.php.net/manual/en/function.rmdir.php#108113
     *
     * @param string $dir Directory to remove
     */
    private function rrmdir($dir)
    {
        foreach (glob($dir . '/*') as $file) {
            if (is_dir($file))
                $this->rrmdir($file);
            else
                unlink($file);
        }
        rmdir($dir);
    }


    /**
     * PHPs filesize() fails to measure files larger than 2gb
     * @see http://stackoverflow.com/a/5502328/189673
     *
     * @param string $file Path to the file to measure
     * @return int
     */
    protected function filesize($file)
    {
        if (!file_exists($file)) {
            $this->log("cannot measure $file, 'cause it doesn't exist.");
            return false;
        }

        static $iswin;
        if (!isset($iswin)) {
            $iswin = (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN');
        }

        static $exec_works;
        if (!isset($exec_works)) {
            $exec_works = (function_exists('exec') && !ini_get('safe_mode') && @exec('echo EXEC') == 'EXEC');
        }

        // try a shell command
        if ($exec_works) {
            $cmd = ($iswin) ? "for %F in (\"$file\") do @echo %~zF" : "stat -c%s \"$file\"";
            @exec($cmd, $output);
            if (is_array($output) && is_numeric($size = trim(implode("\n", $output)))) {
                $this->log("filesize obtained via exec.");
                return $size;
            }
        }

        // try the Windows COM interface
        if ($iswin && class_exists("COM")) {
            try {
                $fsobj = new COM('Scripting.FileSystemObject');
                $f = $fsobj->GetFile(realpath($file));
                $size = $f->Size;
            } catch (Exception $e) {
                $size = null;
            }
            if (ctype_digit($size)) {
                $this->log("filesize obtained via Scripting.FileSystemObject.");
                return $size;
            }
        }

        // if everything else fails
        $this->log("filesize obtained via native filesize.");
        return @filesize($file);
    }


    /**
     * Obtain the blocking lock on the specified file. All processes looking to work with
     * the same file will have to wait, until we release it (@see unlockTheFile).
     *
     * @param string $file_name File to lock
     */
    private function lockTheFile($file_name)
    {
        $file_path = $this->getTargetPathFor($file_name);
        $this->out = fopen("$file_path.lock", 'w');
        flock($this->out, LOCK_EX); // obtain blocking lock
    }


    /**
     * Release the blocking lock on the specified file.
     *
     * @param string $file_name File to lock
     */
    private function unlockTheFile($file_name)
    {
        $file_path = $this->getTargetPathFor($file_name);
        fclose($this->out);
        @unlink("$file_path.lock");
    }


    /**
     * Reset private variables to their initial values.
     */
    private function reset()
    {
        $conf = $this->conf;
        $this->error = null;

        if (is_resource($this->out)) {
            fclose($this->out);
        }
    }


    /**
     * Log the message to the log_path, but only if debug is set to true.
     * Each message will get prepended with the current timestamp.
     *
     * @param string $msg
     */
    protected function log($msg)
    {
        if (!$this->conf['debug']) {
            return;
        }
        $msg = date("Y-m-d H:i:s") . ": $msg\n";
        file_put_contents($this->conf['log_path'], $msg, FILE_APPEND);
    }


}
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3.想要实现上传的图片视频进行拖动排序的话，可以使用Sortable.js插件：

3.1引入js

<script src="/js/Sortable.js"></script>
1

sortale的使用很简单，直接把下卖弄代码写入js即可，替换下面包含图片或视频的ul的id即可，其他均不用修改。

(function () {
    'use strict';

    var byId = function (id) { return document.getElementById(id); },

        loadScripts = function (desc, callback) {
            var deps = [], key, idx = 0;

            for (key in desc) {
                deps.push(key);
            }

            (function _next() {
                var pid,
                    name = deps[idx],
                    script = document.createElement('script');

                script.type = 'text/javascript';
                script.src = desc[deps[idx]];

                pid = setInterval(function () {
                    if (window[name]) {
                        clearTimeout(pid);

                        deps[idx++] = window[name];

                        if (deps[idx]) {
                            _next();
                        } else {
                            callback.apply(null, deps);
                        }
                    }
                }, 30);

                document.getElementsByTagName('head')[0].appendChild(script);
            })()
        },

        console = window.console;


    if (!console.log) {
        console.log = function () {
            alert([].join.apply(arguments, ' '));
        };
    }


    Sortable.create(byId('pic-list'), {//只需根据你的情况替换这里的id
        group: "words",
        animation: 150,
        store: {
            get: function (sortable) {
                var order = localStorage.getItem(sortable.options.group);
                return order ? order.split('|') : [];
            },
            set: function (sortable) {
                var order = sortable.toArray();
                localStorage.setItem(sortable.options.group, order.join('|'));
            }
        },
        onAdd: function (evt){ console.log('onAdd.foo:', [evt.item, evt.from]); },
        onUpdate: function (evt){ console.log('onUpdate.foo:', [evt.item, evt.from]); },
        onRemove: function (evt){ console.log('onRemove.foo:', [evt.item, evt.from]); },
        onStart:function(evt){ console.log('onStart.foo:', [evt.item, evt.from]);},
        onSort:function(evt){ console.log('onStart.foo:', [evt.item, evt.from]);},
        onEnd: function(evt){ console.log('onEnd.foo:', [evt.item, evt.from]);}
    });


    Sortable.create(byId('bar'), {
        group: "words",
        animation: 150,
        onAdd: function (evt){ console.log('onAdd.bar:', evt.item); },
        onUpdate: function (evt){ console.log('onUpdate.bar:', evt.item); },
        onRemove: function (evt){ console.log('onRemove.bar:', evt.item); },
        onStart:function(evt){ console.log('onStart.foo:', evt.item);},
        onEnd: function(evt){ console.log('onEnd.foo:', evt.item);}
    });


    // Multi groups
    Sortable.create(byId('multi'), {
        animation: 150,
        draggable: '.tile',
        handle: '.tile__name'
    });

    [].forEach.call(byId('multi').getElementsByClassName('tile__list'), function (el){
        Sortable.create(el, {
            group: 'photo',
            animation: 150
        });
    });


    // Editable list
    var editableList = Sortable.create(byId('editable'), {
        animation: 150,
        filter: '.js-remove',
        onFilter: function (evt) {
            evt.item.parentNode.removeChild(evt.item);
        }
    });


    byId('addUser').onclick = function () {
        Ply.dialog('prompt', {
            title: 'Add',
            form: { name: 'name' }
        }).done(function (ui) {
            var el = document.createElement('li');
            el.innerHTML = ui.data.name + '<i class="js-remove">✖</i>';
            editableList.el.appendChild(el);
        });
    };


    // Advanced groups
    [{
        name: 'advanced',
        pull: true,
        put: true
    },
        {
            name: 'advanced',
            pull: 'clone',
            put: false
        }, {
        name: 'advanced',
        pull: false,
        put: true
    }].forEach(function (groupOpts, i) {
        Sortable.create(byId('advanced-' + (i + 1)), {
            sort: (i != 1),
            group: groupOpts,
            animation: 150
        });
    });


    // 'handle' option
    Sortable.create(byId('handle-1'), {
        handle: '.drag-handle',
        animation: 150
    });


    // Angular example
    angular.module('todoApp', ['ng-sortable'])
        .constant('ngSortableConfig', {onEnd: function() {
                console.log('default onEnd()');
            }})
        .controller('TodoController', ['$scope', function ($scope) {
            $scope.todos = [
                {text: 'learn angular', done: true},
                {text: 'build an angular app', done: false}
            ];

            $scope.addTodo = function () {
                $scope.todos.push({text: $scope.todoText, done: false});
                $scope.todoText = '';
            };

            $scope.remaining = function () {
                var count = 0;
                angular.forEach($scope.todos, function (todo) {
                    count += todo.done ? 0 : 1;
                });
                return count;
            };

            $scope.archive = function () {
                var oldTodos = $scope.todos;
                $scope.todos = [];
                angular.forEach(oldTodos, function (todo) {
                    if (!todo.done) $scope.todos.push(todo);
                });
            };
        }])
        .controller('TodoControllerNext', ['$scope', function ($scope) {
            $scope.todos = [
                {text: 'learn Sortable', done: true},
                {text: 'use ng-sortable', done: false},
                {text: 'Enjoy', done: false}
            ];

            $scope.remaining = function () {
                var count = 0;
                angular.forEach($scope.todos, function (todo) {
                    count += todo.done ? 0 : 1;
                });
                return count;
            };

            $scope.sortableConfig = { group: 'todo', animation: 150 };
            'Start End Add Update Remove Sort'.split(' ').forEach(function (name) {
                $scope.sortableConfig['on' + name] = console.log.bind(console, name);
            });
        }]);
})();



// Background
document.addEventListener("DOMContentLoaded", function () {
    function setNoiseBackground(el, width, height, opacity) {
        var canvas = document.createElement("canvas");
        var context = canvas.getContext("2d");

        canvas.width = width;
        canvas.height = height;

        for (var i = 0; i < width; i++) {
            for (var j = 0; j < height; j++) {
                var val = Math.floor(Math.random() * 255);
                context.fillStyle = "rgba(" + val + "," + val + "," + val + "," + opacity + ")";
                context.fillRect(i, j, 1, 1);
            }
        }

        el.style.background = "url(" + canvas.toDataURL("image/png") + ")";
    }

    setNoiseBackground(document.getElementsByTagName('body')[0], 50, 50, 0.02);
}, false);
**
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另：Sortable.js也贴出来

**
/**!
* Sortable
* @author RubaXa trash@rubaxa.org
* @license MIT
*/

(function sortableModule(factory) {
	"use strict";

	if (typeof define === "function" && define.amd) {
		define(factory);
	}
	else if (typeof module != "undefined" && typeof module.exports != "undefined") {
		module.exports = factory();
	}
	else {
		/* jshint sub:true */
		window["Sortable"] = factory();
	}
})(function sortableFactory() {
	"use strict";

	if (typeof window === "undefined" || !window.document) {
		return function sortableError() {
			throw new Error("Sortable.js requires a window with a document");
		};
	}

	var dragEl,
		parentEl,
		ghostEl,
		cloneEl,
		rootEl,
		nextEl,
		lastDownEl,

		scrollEl,
		scrollParentEl,
		scrollCustomFn,

		lastEl,
		lastCSS,
		lastParentCSS,

		oldIndex,
		newIndex,

		activeGroup,
		putSortable,

		autoScroll = {},

		tapEvt,
		touchEvt,

		moved,

		forRepaintDummy,

		/** @const */
		R_SPACE = /\s+/g,
		R_FLOAT = /left|right|inline/,

		expando = 'Sortable' + (new Date).getTime(),

		win = window,
		document = win.document,
		parseInt = win.parseInt,
		setTimeout = win.setTimeout,

		$ = win.jQuery || win.Zepto,
		Polymer = win.Polymer,

		captureMode = false,
		passiveMode = false,

		supportDraggable = ('draggable' in document.createElement('div')),
		supportCssPointerEvents = (function (el) {
			// false when IE11
			if (!!navigator.userAgent.match(/(?:Trident.*rv[ :]?11\.|msie)/i)) {
				return false;
			}
			el = document.createElement('x');
			el.style.cssText = 'pointer-events:auto';
			return el.style.pointerEvents === 'auto';
		})(),

		_silent = false,

		abs = Math.abs,
		min = Math.min,

		savedInputChecked = [],
		touchDragOverListeners = [],

		alwaysFalse = function () { return false; },

		_autoScroll = _throttle(function (/**Event*/evt, /**Object*/options, /**HTMLElement*/rootEl) {
			// Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=505521
			if (rootEl && options.scroll) {
				var _this = rootEl[expando],
					el,
					rect,
					sens = options.scrollSensitivity,
					speed = options.scrollSpeed,

					x = evt.clientX,
					y = evt.clientY,

					winWidth = window.innerWidth,
					winHeight = window.innerHeight,

					vx,
					vy,

					scrollOffsetX,
					scrollOffsetY
				;

				// Delect scrollEl
				if (scrollParentEl !== rootEl) {
					scrollEl = options.scroll;
					scrollParentEl = rootEl;
					scrollCustomFn = options.scrollFn;

					if (scrollEl === true) {
						scrollEl = rootEl;

						do {
							if ((scrollEl.offsetWidth < scrollEl.scrollWidth) ||
								(scrollEl.offsetHeight < scrollEl.scrollHeight)
							) {
								break;
							}
							/* jshint boss:true */
						} while (scrollEl = scrollEl.parentNode);
					}
				}

				if (scrollEl) {
					el = scrollEl;
					rect = scrollEl.getBoundingClientRect();
					vx = (abs(rect.right - x) <= sens) - (abs(rect.left - x) <= sens);
					vy = (abs(rect.bottom - y) <= sens) - (abs(rect.top - y) <= sens);
				}


				if (!(vx || vy)) {
					vx = (winWidth - x <= sens) - (x <= sens);
					vy = (winHeight - y <= sens) - (y <= sens);

					/* jshint expr:true */
					(vx || vy) && (el = win);
				}


				if (autoScroll.vx !== vx || autoScroll.vy !== vy || autoScroll.el !== el) {
					autoScroll.el = el;
					autoScroll.vx = vx;
					autoScroll.vy = vy;

					clearInterval(autoScroll.pid);

					if (el) {
						autoScroll.pid = setInterval(function () {
							scrollOffsetY = vy ? vy * speed : 0;
							scrollOffsetX = vx ? vx * speed : 0;

							if ('function' === typeof(scrollCustomFn)) {
								if (scrollCustomFn.call(_this, scrollOffsetX, scrollOffsetY, evt, touchEvt, el) !== 'continue') {
									return;
								}
							}

							if (el === win) {
								win.scrollTo(win.pageXOffset + scrollOffsetX, win.pageYOffset + scrollOffsetY);
							} else {
								el.scrollTop += scrollOffsetY;
								el.scrollLeft += scrollOffsetX;
							}
						}, 24);
					}
				}
			}
		}, 30),

		_prepareGroup = function (options) {
			function toFn(value, pull) {
				if (value == null || value === true) {
					value = group.name;
					if (value == null) {
						return alwaysFalse;
					}
				}

				if (typeof value === 'function') {
					return value;
				} else {
					return function (to, from) {
						var fromGroup = from.options.group.name;

						return pull
							? value
							: value && (value.join
								? value.indexOf(fromGroup) > -1
								: (fromGroup == value)
							);
					};
				}
			}

			var group = {};
			var originalGroup = options.group;

			if (!originalGroup || typeof originalGroup != 'object') {
				originalGroup = {name: originalGroup};
			}

			group.name = originalGroup.name;
			group.checkPull = toFn(originalGroup.pull, true);
			group.checkPut = toFn(originalGroup.put);
			group.revertClone = originalGroup.revertClone;

			options.group = group;
		}
	;

	// Detect support a passive mode
	try {
		window.addEventListener('test', null, Object.defineProperty({}, 'passive', {
			get: function () {
				// `false`, because everything starts to work incorrectly and instead of d'n'd,
				// begins the page has scrolled.
				passiveMode = false;
				captureMode = {
					capture: false,
					passive: passiveMode
				};
			}
		}));
	} catch (err) {}

	/**
	 * @class  Sortable
	 * @param  {HTMLElement}  el
	 * @param  {Object}       [options]
	 */
	function Sortable(el, options) {
		if (!(el && el.nodeType && el.nodeType === 1)) {
			throw 'Sortable: `el` must be HTMLElement, and not ' + {}.toString.call(el);
		}

		this.el = el; // root element
		this.options = options = _extend({}, options);


		// Export instance
		el[expando] = this;

		// Default options
		var defaults = {
			group: null,
			sort: true,
			disabled: false,
			store: null,
			handle: null,
      scroll: true,
			scrollSensitivity: 30,
			scrollSpeed: 10,
			draggable: /[uo]l/i.test(el.nodeName) ? 'li' : '>*',
			ghostClass: 'sortable-ghost',
			chosenClass: 'sortable-chosen',
			dragClass: 'sortable-drag',
			ignore: 'a, img',
			filter: null,
			preventOnFilter: true,
			animation: 0,
			setData: function (dataTransfer, dragEl) {
				dataTransfer.setData('Text', dragEl.textContent);
			},
			dropBubble: false,
			dragoverBubble: false,
			dataIdAttr: 'data-id',
			delay: 0,
			touchStartThreshold: parseInt(window.devicePixelRatio, 10) || 1,
			forceFallback: false,
			fallbackClass: 'sortable-fallback',
			fallbackOnBody: false,
			fallbackTolerance: 0,
			fallbackOffset: {x: 0, y: 0},
			supportPointer: Sortable.supportPointer !== false
		};


		// Set default options
		for (var name in defaults) {
			!(name in options) && (options[name] = defaults[name]);
		}

		_prepareGroup(options);

		// Bind all private methods
		for (var fn in this) {
			if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
				this[fn] = this[fn].bind(this);
			}
		}

		// Setup drag mode
		this.nativeDraggable = options.forceFallback ? false : supportDraggable;

		// Bind events
		_on(el, 'mousedown', this._onTapStart);
		_on(el, 'touchstart', this._onTapStart);
		options.supportPointer && _on(el, 'pointerdown', this._onTapStart);

		if (this.nativeDraggable) {
			_on(el, 'dragover', this);
			_on(el, 'dragenter', this);
		}

		touchDragOverListeners.push(this._onDragOver);

		// Restore sorting
		options.store && this.sort(options.store.get(this));
	}


	Sortable.prototype = /** @lends Sortable.prototype */ {
		constructor: Sortable,

		_onTapStart: function (/** Event|TouchEvent */evt) {
			var _this = this,
				el = this.el,
				options = this.options,
				preventOnFilter = options.preventOnFilter,
				type = evt.type,
				touch = evt.touches && evt.touches[0],
				target = (touch || evt).target,
				originalTarget = evt.target.shadowRoot && (evt.path && evt.path[0]) || target,
				filter = options.filter,
				startIndex;

			_saveInputCheckedState(el);


			// Don't trigger start event when an element is been dragged, otherwise the evt.oldindex always wrong when set option.group.
			if (dragEl) {
				return;
			}

			if (/mousedown|pointerdown/.test(type) && evt.button !== 0 || options.disabled) {
				return; // only left button or enabled
			}

			// cancel dnd if original target is content editable
			if (originalTarget.isContentEditable) {
				return;
			}

			target = _closest(target, options.draggable, el);

			if (!target) {
				return;
			}

			if (lastDownEl === target) {
				// Ignoring duplicate `down`
				return;
			}

			// Get the index of the dragged element within its parent
			startIndex = _index(target, options.draggable);

			// Check filter
			if (typeof filter === 'function') {
				if (filter.call(this, evt, target, this)) {
					_dispatchEvent(_this, originalTarget, 'filter', target, el, el, startIndex);
					preventOnFilter && evt.preventDefault();
					return; // cancel dnd
				}
			}
			else if (filter) {
				filter = filter.split(',').some(function (criteria) {
					criteria = _closest(originalTarget, criteria.trim(), el);

					if (criteria) {
						_dispatchEvent(_this, criteria, 'filter', target, el, el, startIndex);
						return true;
					}
				});

				if (filter) {
					preventOnFilter && evt.preventDefault();
					return; // cancel dnd
				}
			}

			if (options.handle && !_closest(originalTarget, options.handle, el)) {
				return;
			}

			// Prepare `dragstart`
			this._prepareDragStart(evt, touch, target, startIndex);
		},

		_prepareDragStart: function (/** Event */evt, /** Touch */touch, /** HTMLElement */target, /** Number */startIndex) {
			var _this = this,
				el = _this.el,
				options = _this.options,
				ownerDocument = el.ownerDocument,
				dragStartFn;

			if (target && !dragEl && (target.parentNode === el)) {
				tapEvt = evt;

				rootEl = el;
				dragEl = target;
				parentEl = dragEl.parentNode;
				nextEl = dragEl.nextSibling;
				lastDownEl = target;
				activeGroup = options.group;
				oldIndex = startIndex;

				this._lastX = (touch || evt).clientX;
				this._lastY = (touch || evt).clientY;

				dragEl.style['will-change'] = 'all';

				dragStartFn = function () {
					// Delayed drag has been triggered
					// we can re-enable the events: touchmove/mousemove
					_this._disableDelayedDrag();

					// Make the element draggable
					dragEl.draggable = _this.nativeDraggable;

					// Chosen item
					_toggleClass(dragEl, options.chosenClass, true);

					// Bind the events: dragstart/dragend
					_this._triggerDragStart(evt, touch);

					// Drag start event
					_dispatchEvent(_this, rootEl, 'choose', dragEl, rootEl, rootEl, oldIndex);
				};

				// Disable "draggable"
				options.ignore.split(',').forEach(function (criteria) {
					_find(dragEl, criteria.trim(), _disableDraggable);
				});

				_on(ownerDocument, 'mouseup', _this._onDrop);
				_on(ownerDocument, 'touchend', _this._onDrop);
				_on(ownerDocument, 'touchcancel', _this._onDrop);
				_on(ownerDocument, 'selectstart', _this);
				options.supportPointer && _on(ownerDocument, 'pointercancel', _this._onDrop);

				if (options.delay) {
					// If the user moves the pointer or let go the click or touch
					// before the delay has been reached:
					// disable the delayed drag
					_on(ownerDocument, 'mouseup', _this._disableDelayedDrag);
					_on(ownerDocument, 'touchend', _this._disableDelayedDrag);
					_on(ownerDocument, 'touchcancel', _this._disableDelayedDrag);
					_on(ownerDocument, 'mousemove', _this._disableDelayedDrag);
					_on(ownerDocument, 'touchmove', _this._delayedDragTouchMoveHandler);
					options.supportPointer && _on(ownerDocument, 'pointermove', _this._delayedDragTouchMoveHandler);

					_this._dragStartTimer = setTimeout(dragStartFn, options.delay);
				} else {
					dragStartFn();
				}


			}
		},

		_delayedDragTouchMoveHandler: function (/** TouchEvent|PointerEvent **/e) {
			if (min(abs(e.clientX - this._lastX), abs(e.clientY - this._lastY)) >= this.options.touchStartThreshold) {
				this._disableDelayedDrag();
			}
		},

		_disableDelayedDrag: function () {
			var ownerDocument = this.el.ownerDocument;

			clearTimeout(this._dragStartTimer);
			_off(ownerDocument, 'mouseup', this._disableDelayedDrag);
			_off(ownerDocument, 'touchend', this._disableDelayedDrag);
			_off(ownerDocument, 'touchcancel', this._disableDelayedDrag);
			_off(ownerDocument, 'mousemove', this._disableDelayedDrag);
			_off(ownerDocument, 'touchmove', this._disableDelayedDrag);
			_off(ownerDocument, 'pointermove', this._disableDelayedDrag);
		},

		_triggerDragStart: function (/** Event */evt, /** Touch */touch) {
			touch = touch || (evt.pointerType == 'touch' ? evt : null);

			if (touch) {
				// Touch device support
				tapEvt = {
					target: dragEl,
					clientX: touch.clientX,
					clientY: touch.clientY
				};

				this._onDragStart(tapEvt, 'touch');
			}
			else if (!this.nativeDraggable) {
				this._onDragStart(tapEvt, true);
			}
			else {
				_on(dragEl, 'dragend', this);
				_on(rootEl, 'dragstart', this._onDragStart);
			}

			try {
				if (document.selection) {
					// Timeout neccessary for IE9
					_nextTick(function () {
						document.selection.empty();
					});
				} else {
					window.getSelection().removeAllRanges();
				}
			} catch (err) {
			}
		},

		_dragStarted: function () {
			if (rootEl && dragEl) {
				var options = this.options;

				// Apply effect
				_toggleClass(dragEl, options.ghostClass, true);
				_toggleClass(dragEl, options.dragClass, false);

				Sortable.active = this;

				// Drag start event
				_dispatchEvent(this, rootEl, 'start', dragEl, rootEl, rootEl, oldIndex);
			} else {
				this._nulling();
			}
		},

		_emulateDragOver: function () {
			if (touchEvt) {
				if (this._lastX === touchEvt.clientX && this._lastY === touchEvt.clientY) {
					return;
				}

				this._lastX = touchEvt.clientX;
				this._lastY = touchEvt.clientY;

				if (!supportCssPointerEvents) {
					_css(ghostEl, 'display', 'none');
				}

				var target = document.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
				var parent = target;
				var i = touchDragOverListeners.length;

				while (target && target.shadowRoot) {
					target = target.shadowRoot.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
					parent = target;
				}

				if (parent) {
					do {
						if (parent[expando]) {
							while (i--) {
								touchDragOverListeners[i]({
									clientX: touchEvt.clientX,
									clientY: touchEvt.clientY,
									target: target,
									rootEl: parent
								});
							}

							break;
						}

						target = parent; // store last element
					}
					/* jshint boss:true */
					while (parent = parent.parentNode);
				}

				if (!supportCssPointerEvents) {
					_css(ghostEl, 'display', '');
				}
			}
		},


		_onTouchMove: function (/**TouchEvent*/evt) {
			if (tapEvt) {
				var	options = this.options,
					fallbackTolerance = options.fallbackTolerance,
					fallbackOffset = options.fallbackOffset,
					touch = evt.touches ? evt.touches[0] : evt,
					dx = (touch.clientX - tapEvt.clientX) + fallbackOffset.x,
					dy = (touch.clientY - tapEvt.clientY) + fallbackOffset.y,
					translate3d = evt.touches ? 'translate3d(' + dx + 'px,' + dy + 'px,0)' : 'translate(' + dx + 'px,' + dy + 'px)';

				// only set the status to dragging, when we are actually dragging
				if (!Sortable.active) {
					if (fallbackTolerance &&
						min(abs(touch.clientX - this._lastX), abs(touch.clientY - this._lastY)) < fallbackTolerance
					) {
						return;
					}

					this._dragStarted();
				}

				// as well as creating the ghost element on the document body
				this._appendGhost();

				moved = true;
				touchEvt = touch;

				_css(ghostEl, 'webkitTransform', translate3d);
				_css(ghostEl, 'mozTransform', translate3d);
				_css(ghostEl, 'msTransform', translate3d);
				_css(ghostEl, 'transform', translate3d);

				evt.preventDefault();
			}
		},

		_appendGhost: function () {
			if (!ghostEl) {
				var rect = dragEl.getBoundingClientRect(),
					css = _css(dragEl),
					options = this.options,
					ghostRect;

				ghostEl = dragEl.cloneNode(true);

				_toggleClass(ghostEl, options.ghostClass, false);
				_toggleClass(ghostEl, options.fallbackClass, true);
				_toggleClass(ghostEl, options.dragClass, true);

				_css(ghostEl, 'top', rect.top - parseInt(css.marginTop, 10));
				_css(ghostEl, 'left', rect.left - parseInt(css.marginLeft, 10));
				_css(ghostEl, 'width', rect.width);
				_css(ghostEl, 'height', rect.height);
				_css(ghostEl, 'opacity', '0.8');
				_css(ghostEl, 'position', 'fixed');
				_css(ghostEl, 'zIndex', '100000');
				_css(ghostEl, 'pointerEvents', 'none');

				options.fallbackOnBody && document.body.appendChild(ghostEl) || rootEl.appendChild(ghostEl);

				// Fixing dimensions.
				ghostRect = ghostEl.getBoundingClientRect();
				_css(ghostEl, 'width', rect.width * 2 - ghostRect.width);
				_css(ghostEl, 'height', rect.height * 2 - ghostRect.height);
			}
		},

		_onDragStart: function (/**Event*/evt, /**boolean*/useFallback) {
			var _this = this;
			var dataTransfer = evt.dataTransfer;
			var options = _this.options;

			_this._offUpEvents();

			if (activeGroup.checkPull(_this, _this, dragEl, evt)) {
				cloneEl = _clone(dragEl);

				cloneEl.draggable = false;
				cloneEl.style['will-change'] = '';

				_css(cloneEl, 'display', 'none');
				_toggleClass(cloneEl, _this.options.chosenClass, false);

				// #1143: IFrame support workaround
				_this._cloneId = _nextTick(function () {
					rootEl.insertBefore(cloneEl, dragEl);
					_dispatchEvent(_this, rootEl, 'clone', dragEl);
				});
			}

			_toggleClass(dragEl, options.dragClass, true);

			if (useFallback) {
				if (useFallback === 'touch') {
					// Bind touch events
					_on(document, 'touchmove', _this._onTouchMove);
					_on(document, 'touchend', _this._onDrop);
					_on(document, 'touchcancel', _this._onDrop);

					if (options.supportPointer) {
						_on(document, 'pointermove', _this._onTouchMove);
						_on(document, 'pointerup', _this._onDrop);
					}
				} else {
					// Old brwoser
					_on(document, 'mousemove', _this._onTouchMove);
					_on(document, 'mouseup', _this._onDrop);
				}

				_this._loopId = setInterval(_this._emulateDragOver, 50);
			}
			else {
				if (dataTransfer) {
					dataTransfer.effectAllowed = 'move';
					options.setData && options.setData.call(_this, dataTransfer, dragEl);
				}

				_on(document, 'drop', _this);

				// #1143: Бывает элемент с IFrame внутри блокирует `drop`,
				// поэтому если вызвался `mouseover`, значит надо отменять весь d'n'd.
				// Breaking Chrome 62+
				// _on(document, 'mouseover', _this);

				_this._dragStartId = _nextTick(_this._dragStarted);
			}
		},

		_onDragOver: function (/**Event*/evt) {
			var el = this.el,
				target,
				dragRect,
				targetRect,
				revert,
				options = this.options,
				group = options.group,
				activeSortable = Sortable.active,
				isOwner = (activeGroup === group),
				isMovingBetweenSortable = false,
				canSort = options.sort;

			if (evt.preventDefault !== void 0) {
				evt.preventDefault();
				!options.dragoverBubble && evt.stopPropagation();
			}

			if (dragEl.animated) {
				return;
			}

			moved = true;

			if (activeSortable && !options.disabled &&
				(isOwner
					? canSort || (revert = !rootEl.contains(dragEl)) // Reverting item into the original list
					: (
						putSortable === this ||
						(
							(activeSortable.lastPullMode = activeGroup.checkPull(this, activeSortable, dragEl, evt)) &&
							group.checkPut(this, activeSortable, dragEl, evt)
						)
					)
				) &&
				(evt.rootEl === void 0 || evt.rootEl === this.el) // touch fallback
			) {
				// Smart auto-scrolling
				_autoScroll(evt, options, this.el);

				if (_silent) {
					return;
				}

				target = _closest(evt.target, options.draggable, el);
				dragRect = dragEl.getBoundingClientRect();

				if (putSortable !== this) {
					putSortable = this;
					isMovingBetweenSortable = true;
				}

				if (revert) {
					_cloneHide(activeSortable, true);
					parentEl = rootEl; // actualization

					if (cloneEl || nextEl) {
						rootEl.insertBefore(dragEl, cloneEl || nextEl);
					}
					else if (!canSort) {
						rootEl.appendChild(dragEl);
					}

					return;
				}


				if ((el.children.length === 0) || (el.children[0] === ghostEl) ||
					(el === evt.target) && (_ghostIsLast(el, evt))
				) {
					//assign target only if condition is true
					if (el.children.length !== 0 && el.children[0] !== ghostEl && el === evt.target) {
						target = el.lastElementChild;
					}

					if (target) {
						if (target.animated) {
							return;
						}

						targetRect = target.getBoundingClientRect();
					}

					_cloneHide(activeSortable, isOwner);

					if (_onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt) !== false) {
						if (!dragEl.contains(el)) {
							el.appendChild(dragEl);
							parentEl = el; // actualization
						}

						this._animate(dragRect, dragEl);
						target && this._animate(targetRect, target);
					}
				}
				else if (target && !target.animated && target !== dragEl && (target.parentNode[expando] !== void 0)) {
					if (lastEl !== target) {
						lastEl = target;
						lastCSS = _css(target);
						lastParentCSS = _css(target.parentNode);
					}

					targetRect = target.getBoundingClientRect();

					var width = targetRect.right - targetRect.left,
						height = targetRect.bottom - targetRect.top,
						floating = R_FLOAT.test(lastCSS.cssFloat + lastCSS.display)
							|| (lastParentCSS.display == 'flex' && lastParentCSS['flex-direction'].indexOf('row') === 0),
						isWide = (target.offsetWidth > dragEl.offsetWidth),
						isLong = (target.offsetHeight > dragEl.offsetHeight),
						halfway = (floating ? (evt.clientX - targetRect.left) / width : (evt.clientY - targetRect.top) / height) > 0.5,
						nextSibling = target.nextElementSibling,
						after = false
					;

					if (floating) {
						var elTop = dragEl.offsetTop,
							tgTop = target.offsetTop;

						if (elTop === tgTop) {
							after = (target.previousElementSibling === dragEl) && !isWide || halfway && isWide;
						}
						else if (target.previousElementSibling === dragEl || dragEl.previousElementSibling === target) {
							after = (evt.clientY - targetRect.top) / height > 0.5;
						} else {
							after = tgTop > elTop;
						}
						} else if (!isMovingBetweenSortable) {
						after = (nextSibling !== dragEl) && !isLong || halfway && isLong;
					}

					var moveVector = _onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, after);

					if (moveVector !== false) {
						if (moveVector === 1 || moveVector === -1) {
							after = (moveVector === 1);
						}

						_silent = true;
						setTimeout(_unsilent, 30);

						_cloneHide(activeSortable, isOwner);

						if (!dragEl.contains(el)) {
							if (after && !nextSibling) {
								el.appendChild(dragEl);
							} else {
								target.parentNode.insertBefore(dragEl, after ? nextSibling : target);
							}
						}

						parentEl = dragEl.parentNode; // actualization

						this._animate(dragRect, dragEl);
						this._animate(targetRect, target);
					}
				}
			}
		},

		_animate: function (prevRect, target) {
			var ms = this.options.animation;

			if (ms) {
				var currentRect = target.getBoundingClientRect();

				if (prevRect.nodeType === 1) {
					prevRect = prevRect.getBoundingClientRect();
				}

				_css(target, 'transition', 'none');
				_css(target, 'transform', 'translate3d('
					+ (prevRect.left - currentRect.left) + 'px,'
					+ (prevRect.top - currentRect.top) + 'px,0)'
				);

				forRepaintDummy = target.offsetWidth; // repaint

				_css(target, 'transition', 'all ' + ms + 'ms');
				_css(target, 'transform', 'translate3d(0,0,0)');

				clearTimeout(target.animated);
				target.animated = setTimeout(function () {
					_css(target, 'transition', '');
					_css(target, 'transform', '');
					target.animated = false;
				}, ms);
			}
		},

		_offUpEvents: function () {
			var ownerDocument = this.el.ownerDocument;

			_off(document, 'touchmove', this._onTouchMove);
			_off(document, 'pointermove', this._onTouchMove);
			_off(ownerDocument, 'mouseup', this._onDrop);
			_off(ownerDocument, 'touchend', this._onDrop);
			_off(ownerDocument, 'pointerup', this._onDrop);
			_off(ownerDocument, 'touchcancel', this._onDrop);
			_off(ownerDocument, 'pointercancel', this._onDrop);
			_off(ownerDocument, 'selectstart', this);
		},

		_onDrop: function (/**Event*/evt) {
			var el = this.el,
				options = this.options;

			clearInterval(this._loopId);
			clearInterval(autoScroll.pid);
			clearTimeout(this._dragStartTimer);

			_cancelNextTick(this._cloneId);
			_cancelNextTick(this._dragStartId);

			// Unbind events
			_off(document, 'mouseover', this);
			_off(document, 'mousemove', this._onTouchMove);

			if (this.nativeDraggable) {
				_off(document, 'drop', this);
				_off(el, 'dragstart', this._onDragStart);
			}

			this._offUpEvents();

			if (evt) {
				if (moved) {
					evt.preventDefault();
					!options.dropBubble && evt.stopPropagation();
				}

				ghostEl && ghostEl.parentNode && ghostEl.parentNode.removeChild(ghostEl);

				if (rootEl === parentEl || Sortable.active.lastPullMode !== 'clone') {
					// Remove clone
					cloneEl && cloneEl.parentNode && cloneEl.parentNode.removeChild(cloneEl);
				}

				if (dragEl) {
					if (this.nativeDraggable) {
						_off(dragEl, 'dragend', this);
					}

					_disableDraggable(dragEl);
					dragEl.style['will-change'] = '';

					// Remove class's
					_toggleClass(dragEl, this.options.ghostClass, false);
					_toggleClass(dragEl, this.options.chosenClass, false);

					// Drag stop event
					_dispatchEvent(this, rootEl, 'unchoose', dragEl, parentEl, rootEl, oldIndex, null, evt);

					if (rootEl !== parentEl) {
						newIndex = _index(dragEl, options.draggable);

						if (newIndex >= 0) {
							// Add event
							_dispatchEvent(null, parentEl, 'add', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);

							// Remove event
							_dispatchEvent(this, rootEl, 'remove', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);

							// drag from one list and drop into another
							_dispatchEvent(null, parentEl, 'sort', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
							_dispatchEvent(this, rootEl, 'sort', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
						}
					}
					else {
						if (dragEl.nextSibling !== nextEl) {
							// Get the index of the dragged element within its parent
							newIndex = _index(dragEl, options.draggable);

							if (newIndex >= 0) {
								// drag & drop within the same list
								_dispatchEvent(this, rootEl, 'update', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
								_dispatchEvent(this, rootEl, 'sort', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
							}
						}
					}

					if (Sortable.active) {
						/* jshint eqnull:true */
						if (newIndex == null || newIndex === -1) {
							newIndex = oldIndex;
						}

						_dispatchEvent(this, rootEl, 'end', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);

						// Save sorting
						this.save();
					}
				}

			}

			this._nulling();
		},

		_nulling: function() {
			rootEl =
			dragEl =
			parentEl =
			ghostEl =
			nextEl =
			cloneEl =
			lastDownEl =

			scrollEl =
			scrollParentEl =

			tapEvt =
			touchEvt =

			moved =
			newIndex =

			lastEl =
			lastCSS =

			putSortable =
			activeGroup =
			Sortable.active = null;

			savedInputChecked.forEach(function (el) {
				el.checked = true;
			});
			savedInputChecked.length = 0;
		},

		handleEvent: function (/**Event*/evt) {
			switch (evt.type) {
				case 'drop':
				case 'dragend':
					this._onDrop(evt);
					break;

				case 'dragover':
				case 'dragenter':
					if (dragEl) {
						this._onDragOver(evt);
						_globalDragOver(evt);
					}
					break;

				case 'mouseover':
					this._onDrop(evt);
					break;

				case 'selectstart':
					evt.preventDefault();
					break;
			}
		},


		/**
		 * Serializes the item into an array of string.
		 * @returns {String[]}
		 */
		toArray: function () {
			var order = [],
				el,
				children = this.el.children,
				i = 0,
				n = children.length,
				options = this.options;

			for (; i < n; i++) {
				el = children[i];
				if (_closest(el, options.draggable, this.el)) {
					order.push(el.getAttribute(options.dataIdAttr) || _generateId(el));
				}
			}

			return order;
		},


		/**
		 * Sorts the elements according to the array.
		 * @param  {String[]}  order  order of the items
		 */
		sort: function (order) {
			var items = {}, rootEl = this.el;

			this.toArray().forEach(function (id, i) {
				var el = rootEl.children[i];

				if (_closest(el, this.options.draggable, rootEl)) {
					items[id] = el;
				}
			}, this);

			order.forEach(function (id) {
				if (items[id]) {
					rootEl.removeChild(items[id]);
					rootEl.appendChild(items[id]);
				}
			});
		},


		/**
		 * Save the current sorting
		 */
		save: function () {
			var store = this.options.store;
			store && store.set(this);
		},


		/**
		 * For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
		 * @param   {HTMLElement}  el
		 * @param   {String}       [selector]  default: `options.draggable`
		 * @returns {HTMLElement|null}
		 */
		closest: function (el, selector) {
			return _closest(el, selector || this.options.draggable, this.el);
		},


		/**
		 * Set/get option
		 * @param   {string} name
		 * @param   {*}      [value]
		 * @returns {*}
		 */
		option: function (name, value) {
			var options = this.options;

			if (value === void 0) {
				return options[name];
			} else {
				options[name] = value;

				if (name === 'group') {
					_prepareGroup(options);
				}
			}
		},


		/**
		 * Destroy
		 */
		destroy: function () {
			var el = this.el;

			el[expando] = null;

			_off(el, 'mousedown', this._onTapStart);
			_off(el, 'touchstart', this._onTapStart);
			_off(el, 'pointerdown', this._onTapStart);

			if (this.nativeDraggable) {
				_off(el, 'dragover', this);
				_off(el, 'dragenter', this);
			}

			// Remove draggable attributes
			Array.prototype.forEach.call(el.querySelectorAll('[draggable]'), function (el) {
				el.removeAttribute('draggable');
			});

			touchDragOverListeners.splice(touchDragOverListeners.indexOf(this._onDragOver), 1);

			this._onDrop();

			this.el = el = null;
		}
	};


	function _cloneHide(sortable, state) {
		if (sortable.lastPullMode !== 'clone') {
			state = true;
		}

		if (cloneEl && (cloneEl.state !== state)) {
			_css(cloneEl, 'display', state ? 'none' : '');

			if (!state) {
				if (cloneEl.state) {
					if (sortable.options.group.revertClone) {
						rootEl.insertBefore(cloneEl, nextEl);
						sortable._animate(dragEl, cloneEl);
					} else {
						rootEl.insertBefore(cloneEl, dragEl);
					}
				}
			}

			cloneEl.state = state;
		}
	}


	function _closest(/**HTMLElement*/el, /**String*/selector, /**HTMLElement*/ctx) {
		if (el) {
			ctx = ctx || document;

			do {
				if ((selector === '>*' && el.parentNode === ctx) || _matches(el, selector)) {
					return el;
				}
				/* jshint boss:true */
			} while (el = _getParentOrHost(el));
		}

		return null;
	}


	function _getParentOrHost(el) {
		var parent = el.host;

		return (parent && parent.nodeType) ? parent : el.parentNode;
	}


	function _globalDragOver(/**Event*/evt) {
		if (evt.dataTransfer) {
			evt.dataTransfer.dropEffect = 'move';
		}
		evt.preventDefault();
	}


	function _on(el, event, fn) {
		el.addEventListener(event, fn, captureMode);
	}


	function _off(el, event, fn) {
		el.removeEventListener(event, fn, captureMode);
	}


	function _toggleClass(el, name, state) {
		if (el) {
			if (el.classList) {
				el.classList[state ? 'add' : 'remove'](name);
			}
			else {
				var className = (' ' + el.className + ' ').replace(R_SPACE, ' ').replace(' ' + name + ' ', ' ');
				el.className = (className + (state ? ' ' + name : '')).replace(R_SPACE, ' ');
			}
		}
	}


	function _css(el, prop, val) {
		var style = el && el.style;

		if (style) {
			if (val === void 0) {
				if (document.defaultView && document.defaultView.getComputedStyle) {
					val = document.defaultView.getComputedStyle(el, '');
				}
				else if (el.currentStyle) {
					val = el.currentStyle;
				}

				return prop === void 0 ? val : val[prop];
			}
			else {
				if (!(prop in style)) {
					prop = '-webkit-' + prop;
				}

				style[prop] = val + (typeof val === 'string' ? '' : 'px');
			}
		}
	}


	function _find(ctx, tagName, iterator) {
		if (ctx) {
			var list = ctx.getElementsByTagName(tagName), i = 0, n = list.length;

			if (iterator) {
				for (; i < n; i++) {
					iterator(list[i], i);
				}
			}

			return list;
		}

		return [];
	}



	function _dispatchEvent(sortable, rootEl, name, targetEl, toEl, fromEl, startIndex, newIndex, originalEvt) {
		sortable = (sortable || rootEl[expando]);

		var evt = document.createEvent('Event'),
			options = sortable.options,
			onName = 'on' + name.charAt(0).toUpperCase() + name.substr(1);

		evt.initEvent(name, true, true);

		evt.to = toEl || rootEl;
		evt.from = fromEl || rootEl;
		evt.item = targetEl || rootEl;
		evt.clone = cloneEl;

		evt.oldIndex = startIndex;
		evt.newIndex = newIndex;

		evt.originalEvent = originalEvt;

		rootEl.dispatchEvent(evt);

		if (options[onName]) {
			options[onName].call(sortable, evt);
		}
	}


	function _onMove(fromEl, toEl, dragEl, dragRect, targetEl, targetRect, originalEvt, willInsertAfter) {
		var evt,
			sortable = fromEl[expando],
			onMoveFn = sortable.options.onMove,
			retVal;

		evt = document.createEvent('Event');
		evt.initEvent('move', true, true);

		evt.to = toEl;
		evt.from = fromEl;
		evt.dragged = dragEl;
		evt.draggedRect = dragRect;
		evt.related = targetEl || toEl;
		evt.relatedRect = targetRect || toEl.getBoundingClientRect();
		evt.willInsertAfter = willInsertAfter;

		evt.originalEvent = originalEvt;

		fromEl.dispatchEvent(evt);

		if (onMoveFn) {
			retVal = onMoveFn.call(sortable, evt, originalEvt);
		}

		return retVal;
	}


	function _disableDraggable(el) {
		el.draggable = false;
	}


	function _unsilent() {
		_silent = false;
	}


	/** @returns {HTMLElement|false} */
	function _ghostIsLast(el, evt) {
		var lastEl = el.lastElementChild,
			rect = lastEl.getBoundingClientRect();

		// 5 — min delta
		// abs — нельзя добавлять, а то глюки при наведении сверху
		return (evt.clientY - (rect.top + rect.height) > 5) ||
			(evt.clientX - (rect.left + rect.width) > 5);
	}


	/**
	 * Generate id
	 * @param   {HTMLElement} el
	 * @returns {String}
	 * @private
	 */
	function _generateId(el) {
		var str = el.tagName + el.className + el.src + el.href + el.textContent,
			i = str.length,
			sum = 0;

		while (i--) {
			sum += str.charCodeAt(i);
		}

		return sum.toString(36);
	}

	/**
	 * Returns the index of an element within its parent for a selected set of
	 * elements
	 * @param  {HTMLElement} el
	 * @param  {selector} selector
	 * @return {number}
	 */
	function _index(el, selector) {
		var index = 0;

		if (!el || !el.parentNode) {
			return -1;
		}

		while (el && (el = el.previousElementSibling)) {
			if ((el.nodeName.toUpperCase() !== 'TEMPLATE') && (selector === '>*' || _matches(el, selector))) {
				index++;
			}
		}

		return index;
	}

	function _matches(/**HTMLElement*/el, /**String*/selector) {
		if (el) {
			try {
				if (el.matches) {
					return el.matches(selector);
				} else if (el.msMatchesSelector) {
					return el.msMatchesSelector(selector);
				}
			} catch(_) {
				return false;
			}
		}

		return false;
	}

	function _throttle(callback, ms) {
		var args, _this;

		return function () {
			if (args === void 0) {
				args = arguments;
				_this = this;

				setTimeout(function () {
					if (args.length === 1) {
						callback.call(_this, args[0]);
					} else {
						callback.apply(_this, args);
					}

					args = void 0;
				}, ms);
			}
		};
	}

	function _extend(dst, src) {
		if (dst && src) {
			for (var key in src) {
				if (src.hasOwnProperty(key)) {
					dst[key] = src[key];
				}
			}
		}

		return dst;
	}

	function _clone(el) {
		if (Polymer && Polymer.dom) {
			return Polymer.dom(el).cloneNode(true);
		}
		else if ($) {
			return $(el).clone(true)[0];
		}
		else {
			return el.cloneNode(true);
		}
	}

	function _saveInputCheckedState(root) {
		savedInputChecked.length = 0;

		var inputs = root.getElementsByTagName('input');
		var idx = inputs.length;

		while (idx--) {
			var el = inputs[idx];
			el.checked && savedInputChecked.push(el);
		}
	}

	function _nextTick(fn) {
		return setTimeout(fn, 0);
	}

	function _cancelNextTick(id) {
		return clearTimeout(id);
	}

	// Fixed #973:
	_on(document, 'touchmove', function (evt) {
		if (Sortable.active) {
			evt.preventDefault();
		}
	});

	// Export utils
	Sortable.utils = {
		on: _on,
		off: _off,
		css: _css,
		find: _find,
		is: function (el, selector) {
			return !!_closest(el, selector, el);
		},
		extend: _extend,
		throttle: _throttle,
		closest: _closest,
		toggleClass: _toggleClass,
		clone: _clone,
		index: _index,
		nextTick: _nextTick,
		cancelNextTick: _cancelNextTick
	};


	/**
	 * Create sortable instance
	 * @param {HTMLElement}  el
	 * @param {Object}      [options]
	 */
	Sortable.create = function (el, options) {
		return new Sortable(el, options);
	};


	// Export
	Sortable.version = '1.7.0';
	return Sortable;
});
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