var XMLHttpReq = false;
	 
	//=================== ajax ========================//
	//获取一个XMLHttpRequest对象
	function createXMLHttpRequest() {
		var XMLHttpReq = false;
		if (window.XMLHttpRequest) {
			XMLHttpReq = new XMLHttpRequest();
		} else {
			if (window.ActiveXObject) {
				try {
					XMLHttpReq = new ActiveXObject("Msxml2.XMLHTTP");
				}
				catch (e) {
					try {
						XMLHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
					}
					catch (e) {
					}
				}
			}
		}
		return XMLHttpReq;
	}
	
	//处理返回信息
	//xmlHttp返回值,
	//method:方法名 方法必须带一个参数如doRecive(xNode);
	function returnAjaxResult(req, method) {
		return function () {
			if (req.readyState == 4) {
				if (req.status == 200) {// 将载有响应信息的XML传递到处理函数
					eval(method + "();");
				} else {
					alert('服务器正在更新，带来不便请谅解！');
				}
			}
		};
	}

	//执行客户端Ajax命令//url 数据post地址//postData 发送的数据包//handleMethod　处理返回的方法

	
	function doAjaxCommand(url, postData, handleMethod) {
		XMLHttpReq.open("GET", url, false);
		XMLHttpReq.onreadystatechange = returnAjaxResult(XMLHttpReq, handleMethod);
		XMLHttpReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		XMLHttpReq.setRequestHeader("Content-Type", "text/xml");
		XMLHttpReq.setRequestHeader("charset", "utf-8");
		if (postData) {
			XMLHttpReq.send(postData);
		}
		else {
			XMLHttpReq.send(null);
		}
	}
	
	//=========================== Ajax =========================//