//创建XMLHttpRequest对象    function createXMLHttpRequest() {        try {            XMLHttpReq = new ActiveXObject("Msxml2.XMLHTTP");//IE高版本创建XMLHTTP        }        catch(E) {            try {                XMLHttpReq = new ActiveXObject("Microsoft.XMLHTTP");//IE低版本创建XMLHTTP            }            catch(E) {                XMLHttpReq = new XMLHttpRequest();//兼容非IE浏览器，直接创建XMLHTTP对象            }        }    }    //ajax-post方法    function sendAjaxRequest(url,data,funName) {        createXMLHttpRequest();        XMLHttpReq.open("post", url, true);        XMLHttpReq.setRequestHeader("Content-type","application/x-www-form-urlencoded");        XMLHttpReq.send(data);        XMLHttpReq.onreadystatechange = funName; //指定回调函数    }    //回调函数    function customReponse() {        if (XMLHttpReq.readyState == 4) {            if (XMLHttpReq.status == 200) {                var data = XMLHttpReq.responseText;                ////回调事件//            }        }    }