jq封装websocket插件，实现聊天室重连机制、心跳机制_jquery websocket自动重连

此jq封装方法来自于这里

代码简单易懂，如下：

//jqwebsocket.js
//==========websocket
(function($) {
    $.websocket = function(options) {
        var defaults = {
            domain: top.location.hostname,
            port:3398,
            protocol:""
        };
        var opts = $.extend(defaults,options);
        var szServer = "ws://" + opts.domain + ":" + opts.port + "/" + opts.protocol;
        var socket = null;
        var bOpen = false;
        var t1 = 0; 
        var t2 = 0; 
        var messageevent = {
            onInit:function(){
                if(!("WebSocket" in window) && !("MozWebSocket" in window)){  
                    return false;
                }
                if(("MozWebSocket" in window)){
                    socket = new MozWebSocket(szServer);  
                }else{
                    socket = new WebSocket(szServer);
                }
                if(opts.onInit){
                    opts.onInit();
                }
            },
            onOpen:function(event){
                bOpen = true;
                if(opts.onOpen){
                    opts.onOpen(event);
                }
            },
            onSend:function(msg){
                t1 = new Date().getTime(); 
                if(opts.onSend){
                    opts.onSend(msg);
                }
                socket.send(msg);
            },
            onMessage:function(msg){
                t2 = new Date().getTime(); 
                if(opts.onMessage){
                    opts.onMessage(msg.data,t2 - t1);
                }
            },
            onError:function(event){
                if(opts.onError){
                    opts.onError(event);
                }
            },
            onClose:function(event){
                if(opts.onclose){
                    opts.onclose(event);
           
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