Ajax = function (){
	var navName = (function (){
		var u = navigator.userAgent.toLowerCase();
		if (/gecko/i.test(u)) return "moz";
		if (/msie/i.test(u)) return "ie";
		return "other";
	})();
	var ie = navName=="ie";
	var moz = navName=="moz";
	// xmlHttp对象
	this.xmlHttp = function (){
		if (ie)	{
			for (var i=0; i<2; i++)
			try{
				var r = new ActiveXObject(["MSXML2.XMLHTTP", "Microsoft.XMLHTTP"][i]);
				return r;
			}catch (e) { return null;};
		}
		else return new XMLHttpRequest();
	}
	// xmlDom对象
	this.xmlDom = function (){
		if (ie)
			for (var i=0; i<4; i++)
				try{
					var r = new ActiveXObject(["MSXML2.DOMDocument", "Microsoft.XMLDOM", "MSXML.DOMDocument", "MSXML3.DOMDocument"][i]);
					return r;
				}catch (e){return null;}
		else return document.implementation.createDocument("", "doc", null);
	}
	// 装载一个Http//返回指定url的文本内容，asy指定是否异步，如果异步，xmlHttp做为参数并执行fun
	this.loadHttp = function (url, asy, fun){
		var xmlHttp = this.xmlHttp();
		xmlHttp.open("GET", url + "&iTime=" + Math.random(), (asy ? true : false));
		if (asy){
			xmlHttp.onreadystatechange = function()	{
				if(xmlHttp.readyState==4) fun (xmlHttp);
			};
			xmlHttp.send(null);
		}
		else{
			try{
				xmlHttp.send(null);
			}catch (e){
				throw new Error("LoadHttp Error.");
				return;
			}
			return xmlHttp.responseText;
		}
	}
	// 装载一个XmlDom//返回xmlDom对象，url为xml的地址，asy指定是否异步，如果异步，xmlDom做为参数并执行fun
	this.loadXml = function (url, asy, fun){
		var xmlDom = this.xmlDom();
		xmlDom.async = asy ? true : false;
		if (asy){
			if (ie) xmlDom.onreadystatechange = function (){
				if(xmlDom.readyState == 4) fun(xmlDom);
			} 
			else xmlDom.onload = function (){
				fun(xmlDom);
			}
		}
		xmlDom.load(url + "&iTime=" + Math.random());
		return xmlDom;
	}
	// 取得xmlDom对象的xml内容
	this.getXml = function (xDom){
		if (ie) return xDom.xml;
		else return (new XMLSerializer()).serializeToString(xDom);
	}
	// 二进制转换
	this.Bin2Str = function (binary){
		var rec = new ActiveXObject("ADODB.RecordSet");
		rec.Fields.Append("DDD",201,1);
		rec.open();
		rec.addNew();
		rec(0).appendChunk(binary);
		rec.update();
		var result = rec(0).value;
		rec.Close();
		return result;
	}
}