ajax的timeout问题

Object.extend(Function.prototype, {

	getArguments: function() {

		var args = [];

		for(var i=0; i<this.arguments.length; i++) {

			args.push(this.arguments[i]);

		}

		return args;

	}

}, false);



var MS = {"Browser":{}};



Object.extend(MS.Browser, {

	isIE: navigator.userAgent.indexOf('MSIE') != -1,

	isFirefox: navigator.userAgent.indexOf('Firefox') != -1,

	isOpera: window.opera != null

}, false);



var AjaxPro = {};



AjaxPro.IFrameXmlHttp = function() {};

AjaxPro.IFrameXmlHttp.prototype = {

	onreadystatechange: null, headers: [], method: "POST", url: null, async: true, iframe: null,

	status: 0, readyState: 0, responseText: null,

	abort: function() {

	},

	readystatechanged: function() {

		var doc = this.iframe.contentDocument || this.iframe.document;

		if(doc != null && doc.readyState == "complete" && doc.body != null && doc.body.res != null) {

			this.status = 200;

			this.statusText = "OK";

			this.readyState = 4;

			this.responseText = doc.body.res;

			this.onreadystatechange();

			return;

		}

		setTimeout(this.readystatechanged.bind(this), 10);

	},

	open: function(method, url, async) {

		if(async == false) {

			alert("Synchronous call using IFrameXMLHttp is not supported.");

			return;

		}

		if(this.iframe == null) {

			var iframeID = "hans";

			if (document.createElement && document.documentElement &&

				(window.opera || navigator.userAgent.indexOf('MSIE 5.0') == -1))

			{

				var ifr = document.createElement('iframe');

				ifr.setAttribute('id', iframeID);

				ifr.style.visibility = 'hidden';

				ifr.style.position = 'absolute';

				ifr.style.width = ifr.style.height = ifr.borderWidth = '0px';



				this.iframe = document.getElementsByTagName('body')[0].appendChild(ifr);

			}

			else if (document.body && document.body.insertAdjacentHTML)

			{

				document.body.insertAdjacentHTML('beforeEnd', '<iframe name="' + iframeID + '" id="' + iframeID + '" style="border:1px solid black;display:none"></iframe>');

			}

			if (window.frames && window.frames[iframeID]) {

				this.iframe = window.frames[iframeID];

			}

			this.iframe.name = iframeID;

			this.iframe.document.open();

			this.iframe.document.write("<"+"html><"+"body></"+"body></"+"html>");

			this.iframe.document.close();

		}

		this.method = method;

		this.url = url;

		this.async = async;

	},

	setRequestHeader: function(name, value) {

		for(var i=0; i<this.headers.length; i++) {

			if(this.headers[i].name == name) {

				this.headers[i].value = value;

				return;

			}

		}

		this.headers.push({"name":name,"value":value});

	},

	getResponseHeader: function(name, value) {

		return null;

	},

	addInput: function(doc, form, name, value) {

		var ele;

		var tag = "input";

		if(value.indexOf("\n") >= 0) {

			tag = "textarea";

		}

		

		if(doc.all) {

			ele = doc.createElement("<" + tag + " name=\"" + name + "\" />");

		}else{

			ele = doc.createElement(tag);

			ele.setAttribute("name", name);

		}

		ele.setAttribute("value", value);

		form.appendChild(ele);

		ele = null;

	},

	send: function(data) {

		if(this.iframe == null) {

			return;

		}

		var doc = this.iframe.contentDocument || this.iframe.document;

		var form = doc.createElement("form");

		

		doc.body.appendChild(form);

		

		form.setAttribute("action", this.url);

		form.setAttribute("method", this.method);

		form.setAttribute("enctype", "application/x-www-form-urlencoded");

		

		for(var i=0; i<this.headers.length; i++) {

			switch(this.headers[i].name.toLowerCase()) {

				case "content-length":

				case "accept-encoding":

				case "content-type":

					break;

				default:

					this.addInput(doc, form, this.headers[i].name, this.headers[i].value);

			}

		}

		this.addInput(doc, form, "data", data);

		form.submit();

		

		setTimeout(this.readystatechanged.bind(this), 0);

	}

};



var progids = ["Msxml2.XMLHTTP.6.0", "Msxml2.XMLHTTP.3.0", "MSXML2.XMLHTTP", "Microsoft.XMLHTTP"];

var progid = null;



if(typeof ActiveXObject != "undefined") {

	var ie7xmlhttp = false;

	if(typeof XMLHttpRequest == "object") {

		try{ var o = new XMLHttpRequest(); ie7xmlhttp = true; }catch(e){}

	}

	if(typeof XMLHttpRequest == "undefined" || !ie7xmlhttp) {

		XMLHttpRequest = function() {

			var xmlHttp = null;

			if(!AjaxPro.noActiveX) {

				if(progid != null) {

					return new ActiveXObject(progid);

				}

				for(var i=0; i<progids.length && xmlHttp == null; i++) {

					try {

						xmlHttp = new ActiveXObject(progids[i]);

						progid = progids[i];



					}catch(e){}

				}

			}

			if(xmlHttp == null && MS.Browser.isIE) {

				return new AjaxPro.IFrameXmlHttp();

			}

			return xmlHttp;

		};

	}

}

var r = this.timeout(this.duration, this);