前端常用的js总结_前端常用js

程序员花1小时写JavaScript 常用方法总结
经常使用的 JS 方法，今天记下，以便以后查询




var BrowserInfo = {
userAgent: navigator.userAgent.toLowerCase()
isAndroid: Boolean(navigator.userAgent.match(/android/ig)),
isIphone: Boolean(navigator.userAgent.match(/iphone|ipod/ig)),
isIpad: Boolean(navigator.userAgent.match(/ipad/ig)),
isWeixin: Boolean(navigator.userAgent.match(/MicroMessenger/ig)),
}




function strLength(str) {
var a = 0;
for (var i = 0; i < str.length; i++) {
if (str.charCodeAt(i) > 255)
a += 2;//按照预期计数增加2
else
a++;
}
return a;
}
获取url中的参数


function GetQueryStringRegExp(name,url) {
var reg = new RegExp("(^|\?|&)" + name + "=([^&]*)(\s|&|$)", "i");
if (reg.test(url)) return decodeURIComponent(RegExp.$2.replace(/+/g, " ")); return "";
}




function eventBind(obj, eventType, callBack) {
if (obj.addEventListener) {
obj.addEventListener(eventType, callBack, false);
}
else if (window.attachEvent) {
obj.attachEvent('on' + eventType, callBack);
}
else {
obj['on' + eventType] = callBack;
}
};
eventBind(document, 'click', bodyClick);




function getjsversion(){
var n = navigator;
var u = n.userAgent;
var apn = n.appName;
var v = n.appVersion;
var ie = v.indexOf('MSIE ');
if (ie > 0){
apv = parseInt(i = v.substring(ie + 5));
if (apv > 3) {
apv = parseFloat(i);
}
} else {
apv = parseFloat(v);
}
var isie = (apn == 'Microsoft Internet Explorer');
var ismac = (u.indexOf('Mac') >= 0);
var javascriptVersion = "1.0";
if (String && String.prototype) {
javascriptVersion = '1.1';
if (javascriptVersion.match) {
javascriptVersion = '1.2';
var tm = new Date;
if (tm.setUTCDate) {
javascriptVersion = '1.3';
if (isie && ismac && apv >= 5) javascriptVersion = '1.4';
var pn = 0;
if (pn.toPrecision) {
javascriptVersion = '1.5';
a = new Array;
if (a.forEach) {
javascriptVersion = '1.6';
i = 0;
o = new Object;
tcf = new Function('o', 'var e,i=0;try{i=new Iterator(o)}catch(e){}return i');
i = tcf(o);
if (i && i.next) {
javascriptVersion = '1.7';
}
}
}
}
}
}
return javascriptVersion;
}


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function getEvent() {
if (document.all) {
return window.event; //如果是ie
}
func = getEvent.caller;
while (func != null) {
var arg0 = func.arguments[0];
if (arg0) {
if ((arg0.constructor == Event || arg0.constructor == MouseEvent)
|| (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {
return arg0;
}
}
func = func.caller;
}
return null;
};




getCharactersLen: function (charStr, cutCount) {
if (charStr == null || charStr == '') return '';
var totalCount = 0;
var newStr = '';
for (var i = 0; i < charStr.length; i++) {
var c = charStr.charCodeAt(i);
if (c < 255 && c > 0) {
totalCount++;
} else {
totalCount += 2;
}
if (totalCount >= cutCount) {
newStr += charStr.charAt(i);
break;
}
else {
newStr += charStr.charAt(i);
}
}
return newStr;
}




var tmp = window.open("about:blank", "", "fullscreen=1")
tmp.moveTo(0, 0);
tmp.resizeTo(screen.width + 20, screen.height);
tmp.focus();
tmp.location.href = '//www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html';
var config_ = "left=0,top=0,width=" + (window.screen.Width) + ",height=" + (window.screen.Height);
window.open('//www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html', "winHanle", config_);
//模拟form提交打开新页面
var f = document.createElement("form");
f.setAttribute('action', '//www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html');
f.target = '_blank';
document.body.appendChild(f);
f.submit();




function selectAll(objSelect) {
if (objSelect.checked == true) {
$("input[name='chkId']").attr("checked", true);
$("input[name='chkAll']").attr("checked", true);
}
else if (objSelect.checked == false) {
$("input[name='chkId']").attr("checked", false);
$("input[name='chkAll']").attr("checked", false);
}
}




判断是否是 IE 浏览器
if (document.all){
alert(”IE浏览器”);
}else{
alert(”非IE浏览器”);
}
if (!!window.ActiveXObject){
alert(”IE浏览器”);
}else{
alert(”非IE浏览器”);
}
判断是IE几
var isIE=!!window.ActiveXObject;
var isIE6=isIE&&!window.XMLHttpRequest;
var isIE8=isIE&&!!document.documentMode;
var isIE7=isIE&&!isIE6&&!isIE8;
if (isIE){
if (isIE6){
alert(”ie6″);
}else if (isIE8){
alert(”ie8″);
}else if (isIE7){
alert(”ie7″);
}
}




function getOs() {
if (navigator.userAgent.indexOf("MSIE 8.0") > 0) {
return "MSIE8";
}
else if (navigator.userAgent.indexOf("MSIE 6.0") > 0) {
return "MSIE6";
}
else if (navigator.userAgent.indexOf("MSIE 7.0") > 0) {
return "MSIE7";
}
else if (isFirefox = navigator.userAgent.indexOf("Firefox") > 0) {
return "Firefox";
}
if (navigator.userAgent.indexOf("Chrome") > 0) {
return "Chrome";
}
else {
return "Other";
}
}




//得到日期值并转化成日期格式，replace(/-/g, "/")是根据验证表达式把日期转化成长日期格式，这样再进行判断就好判断了
function ValidateDate() {
var beginDate = $("#t_datestart").val();
var endDate = $("#t_dateend").val();
if (beginDate.length > 0 && endDate.length>0) {
var sDate = new Date(beginDate.replace(/-/g, "/"));
var eDate= new Date(endDate.replace(/-/g, "/"));
if (sDate > eDate) {
alert('开始日期要小于结束日期');
return false;
}
}
}




this.moveBind = function (objId, eventType, callBack) {
var obj = document.getElementById(objId);
if (obj.removeEventListener) {
obj.removeEventListener(eventType, callBack, false);
}
else if (window.detachEvent) {
obj.detachEvent('on' + eventType, callBack);
}
else {
obj['on' + eventType] = null;
}
}




$("id").onkeypress = function (event) {
event = (event) ? event : ((window.event) ? window.event : "")
keyCode = event.keyCode ? event.keyCode : (event.which ? event.which : event.charCode);
if (keyCode == 13) {
$("SubmitLogin").onclick();
}
}




timeStart = new Date().getTime();
timesEnd = new Date().getTime();
document.getElementById("time").innerHTML = timesEnd - timeStart;




function setCookie(name, value, expires, path, domain) {
if (!expires) expires = -1;
if (!path) path = "/";
var d = "" + name + "=" + value;
var e;
if (expires < 0) {
e = "";
}
else if (expires == 0) {
var f = new Date(1970, 1, 1);
e = ";expires=" + f.toUTCString();
}
else {
var now = new Date();
var f = new Date(now.getTime() + expires * 1000);
e = ";expires=" + f.toUTCString();
}
var dm;
if (!domain) {
dm = "";
}
else {
dm = ";domain=" + domain;
}
document.cookie = name + "=" + value + ";path=" + path + e + dm;
};




function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for (var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == ' ') c = c.substring(1, c.length);
if (c.indexOf(nameEQ) == 0) {
return decodeURIComponent(c.substring(nameEQ.length, c.length))
}
} return null
}




C.ajax = function (args) {
var self = this;
this.options = {
type: 'GET',
async: true,
contentType: 'application/x-www-form-urlencoded',
url: 'about:blank',
data: null,
success: {},
error: {}
};
this.getXmlHttp = function () {
var xmlHttp;
try {
xmlhttp = new XMLHttpRequest();
}
catch (e) {
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
if (!xmlhttp) {
alert('您的浏览器不支持AJAX');
return false;
}
return xmlhttp;
};
this.send = function () {
C.each(self.options, function (key, val) {
self.options[key] = (args[key] == null) ? val : args[key];
});
var xmlHttp = new self.getXmlHttp();
if (self.options.type.toUpperCase() == 'GET') {
xmlHttp.open(self.options.type, self.options.url + (self.options.data == null ? "" : ((/[?]$/.test(self.options.url) ? '&' : '?') + self.options.data)), self.options.async);
}
else {
xmlHttp.open(self.options.type, self.options.url, self.options.async);
xmlHttp.setRequestHeader('Content-Length', self.options.data.length);
}
xmlHttp.setRequestHeader('Content-Type', self.options.contentType);
xmlHttp.onreadystatechange = function () {
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200 || xmlHttp.status == 0) {
if (typeof self.options.success == 'function') self.options.success(xmlHttp.responseText);
xmlHttp = null;
}
else {
if (typeof self.options.error == 'function') self.options.error('Server Status: ' + xmlHttp.status);
}
}
};
xmlHttp.send(self.options.type.toUpperCase() == 'POST' ? self.options.data.toString() : null);
};
this.send();
};




function StringBuilder() {
this.strings = new Array;
};
StringBuilder.prototype.append = function (str) {
this.strings.push(str);
};
StringBuilder.prototype.toString = function () {
return this.strings.join('');
};




function loadJS (url, fn) {
var ss = document.getElementsByName('script'),
loaded = false;
for (var i = 0, len = ss.length; i < len; i++) {
if (ss[i].src && ss[i].getAttribute('src') == url) {
loaded = true;
break;
}
}
if (loaded) {
if (fn && typeof fn != 'undefined' && fn instanceof Function) fn();
return false;
}
var s = document.createElement('script'),
b = false;
s.setAttribute('type', 'text/javascript');
s.setAttribute('src', url);
s.onload = s.onreadystatechange = function () {
if (!b && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete')) {
b = true;
if (fn && typeof fn != 'undefined' && fn instanceof Function) fn();
}
};
document.getElementsByTagName('head')[0].appendChild(s);
},
bind: function (objId, eventType, callBack) { //适用于任何浏览器的绑定
var obj = document.getElementById(objId);
if (obj.addEventListener) {
obj.addEventListener(eventType, callBack, false);
}
else if (window.attachEvent) {
obj.attachEvent('on' + eventType, callBack);
}
else {
obj['on' + eventType] = callBack;
}
}
function JSLoad (args) {
s = document.createElement("script");
s.setAttribute("type", "text/javascript");
s.setAttribute("src", args.url);
s.onload = s.onreadystatechange = function () {
if (!s.readyState || s.readyState == "loaded" || s.readyState == "complete") {
if (typeof args.callback == "function") args.callback(this, args);
s.onload = s.onreadystatechange = null;
try {
s.parentNode && s.parentNode.removeChild(s);
} catch (e) { }
}
};
document.getElementsByTagName("head")[0].appendChild(s);
}




function ClearHeadJs (src) {
var js = document.getElementsByTagName('head')[0].children;
var obj = null;
for (var i = 0; i < js.length; i++) {
if (js[i].tagName.toLowerCase() == "script" && js[i].attributes['src'].value.indexOf(src) > 0) {
obj = js[i];
}
}
document.getElementsByTagName('head')[0].removeChild(obj);
};




function URLencode(sStr) {
return escape(sStr).replace(/+/g, '%2B').replace(/"/g, '%22').replace(/'/g, '%27').replace(///g, '%2F');
};




document.body.onkeydown = function (evt) {
evt = evt ? evt : (window.event ? window.event : null);
if (13 == evt.keyCode && evt.ctrlKey) {
evt.returnValue = false;
evt.cancel = true;
PostData();
}
};




function GetCurrentDate() {
var d = new Date();
var y = d.getYear()+1900;
month = add_zero(d.getMonth() + 1),
days = add_zero(d.getDate()),
hours = add_zero(d.getHours());
minutes = add_zero(d.getMinutes()),
seconds = add_zero(d.getSeconds());
var str = y + '-' + month + '-' + days + ' ' + hours + ':' + minutes + ':' + seconds;
return str;
};
function add_zero(temp) {
if (temp < 10) return "0" + temp;
else return temp;
}




String.prototype.Trim = function()
{ return this.replace(/(^s*)|(s*$)/g, ""); }
String.prototype.LTrim = function()
{return this.replace(/(^s*)/g, "");}
String.prototype.RTrim = function()
{return this.replace(/(s*$)/g, "");}




this.ClearHeadJs = function (src) {
var js = document.getElementsByTagName('head')[0].children;
var obj = null;
for (var i = 0; i < js.length; i++) {
if (js[i].tagName.toLowerCase() == "script" && js[i].attributes['src'].value.indexOf(src) > 0) {
obj = js[i];
}
}
document.getElementsByTagName('head')[0].removeChild(obj);
};




function CreateFrom(url, params) {
var f = document.createElement("form");
f.setAttribute("action", url);
for (var i = 0; i < params.length; i++) {
var input = document.createElement("input");
input.setAttribute("type", "hidden");
input.setAttribute("name", params[i].paramName);
input.setAttribute("value", params[i].paramValue);
f.appendChild(input);
}
f.target = "_blank";
document.body.appendChild(f);
f.submit();
};




<script language="javascript">
var jsversion = 1.0;
</script>
<script language="javascript1.1">
jsversion = 1.1;
</script>
<script language="javascript1.2">
jsversion = 1.2;
</script>
<script language="javascript1.3">
jsversion = 1.3;
</script>
<script language="javascript1.4">
jsversion = 1.4;
</script>
<script language="javascript1.5">
jsversion = 1.5;
</script>
<script language="javascript1.6">
jsversion = 1.6;
</script>
<script language="javascript1.7">
jsversion = 1.7;
</script>
<script language="javascript1.8">
jsversion = 1.8;
</script>
<script language="javascript1.9">
jsversion = 1.9;
</script>
<script language="javascript2.0">
jsversion = 2.0;
</script>
alert(jsversion);
最后在说几句：


厉害程序员相对于普通程序员的优势在于：
写出的代码更容易排错，不是高手的代码就不会错，而是高手的代码出了错容易找。高手的代码可读性一定很好，模块清晰，命名规范，格式工整，关键的地方有注释，出了异常有log，自然容易排错，即使交给别人去debug也是比较容易的。
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