Ajax无刷新IE报错

function createXMLHttpRequest() {

    var obj;

    

    if (window.XMLHttpRequest) { //Mozilla 浏览器 

        obj = new XMLHttpRequest();

    }

    else if (window.ActiveXObject) { // IE浏览器 

        try {

            obj = new ActiveXObject("Msxml2.XMLHTTP");

        } catch (e) {

            try {

                obj = new ActiveXObject("Microsoft.XMLHTTP");

            } catch (e) { }

        }

    }

    

    return obj;

}







o = createXMLHttpRequest();

    o.open("GET", url, true);

    o.onreadystatechange = function () {

        if (o.readyState == 4 && o.status == 200) {

            sourceText = o.responseText.split("/n");

            if (sourceText.length > 1) {

                document.getElementById("mainload").innerHTML = "";