var XMLHttpReq;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        }    }}function sendAjaxRequest(url) {    createXMLHttpRequest();                                //创建XMLHttpRequest对象    XMLHttpReq.open("post", url, true);    XMLHttpReq.onreadystatechange = processResponse; //指定响应函数    XMLHttpReq.send(null);}//回调函数function processResponse() {    if (XMLHttpReq.readyState == 4) {        if (XMLHttpReq.status == 200) {            var text = XMLHttpReq.responseText;            /**             *实现回调             */            text = window.decodeURI(text);            var cp = document.getElementById("cp");            cp.innerHTML = "";            var values = text.split("|");            for (var i = 0; i < values.length; i++) {                var temp = document.createElement("option");                temp.text = values[i];                temp.value = values[i];                cp.options.add(temp);            }        }    }}