<script type="text/javascript">
        window.onload = function () {
            loadData();
        };
        function loadData() {
            $.ajax({
                type: "POST",//通常会用到两种：GET,POST。默认是：GET
                url: "Ajax/JavascripFenYe.aspx/LoadDate",//(默认: 当前页地址) 发送请求的地址
                data: "{ type: 'loadDate' }",//组织向后台发送的数据
                dataType: "xml",//预期服务器返回的数据类型。
                beforeSend: beforeSend, //发送请求
                success: callback, //请求成功
                error: error,//请求出错 
                complete: complete,//请求完成
                cache: false,
                async: false,//默认: true) 默认设置下，所有请求均为异步请求。如果需要发送同步请求，请将此选项设置为 false。注意，同步请求将锁住浏览器，用户其它操作必须等待请求完成才可以执行。 
                contentType: "application/json;charset=utf-8"//发送服务器的编码
            });
        };
        function callback(res) {
            var doc = com.createxmldocbystr(res.d);
            var docxml = doc.lastChild;//获得xml的跟节点
            alert(docxml.firstChild);
        };
        function error() { };
        function complete() { };
        function beforeSend() { };
        function Common() {

        }
        //创建xmldoc对象
        Common.prototype.createxmldoc = function () {
            var xmlDoc = null;
            if (window.ActiveXObject) {
                xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
            }
            else if (document.implementation && document.implementation.createDocument) {
                xmlDoc = document.implementation.createDocument("", "", null);
            }
            return xmlDoc;
        }
        //通过字符串创建xmldoc对象
        Common.prototype.createxmldocbystr = function (str) {
            if (window.ActiveXObject) {
                var xmlDoc = new ActiveXObject("Microsoft.XMLDOM")
                xmlDoc.loadXML(str)
                return xmlDoc
            }
            else
                return new DOMParser().parseFromString(str, "text/xml")
        }
        //通过文件创建xmldoc对象
        Common.prototype.CreateXMLDocbypath = function (xmlFilePath) {

            if (window.ActiveXObject) {
                var oXmlHttp = new ActiveXObject('Microsoft.XMLHTTP');
                oXmlHttp.open("get", xmlFilePath, false);
                oXmlHttp.send();
                return oXmlHttp.responseXML;

            }

            else {
                var oXmlHttp = new XMLHttpRequest();
                oXmlHttp.open("get", xmlFilePath, false);
                oXmlHttp.send(null);
                if (oXmlHttp.responseXML == null) {
                    return this.createxmldocbystr(oXmlHttp.responseText);
                }
                return oXmlHttp.responseXML;

            }
        }
        //将xml对象传化为字符串
        Common.prototype.dealxml = function (inparam) {
            var ss = "";
            if (window.ActiveXObject) {
                ss = inparam.xml;
            }
            else if (document.implementation && document.implementation.createDocument) {
                ss = (new XMLSerializer()).serializeToString(inparam);
            }
            return ss;
        }
        var com = new Common();
        //selectSingleNode 各浏览器兼容
        if (document.implementation.hasFeature("XPath", "3.0")) {
            if (typeof XMLDocument == "undefined") { XMLDocument = Document; }
            XMLDocument.prototype.selectNodes = function (cXPathString, xNode) {
                if (!xNode) { xNode = this; }
                var oNSResolver = this.createNSResolver(this.documentElement)
                var aItems = this.evaluate(cXPathString, xNode, oNSResolver, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null)
                var aResult = [];
                for (var i = 0; i < aItems.snapshotLength; i++) { aResult[i] = aItems.snapshotItem(i); }
                return aResult;
            }
            XMLDocument.prototype.selectSingleNode = function (cXPathString, xNode) {
                if (!xNode) { xNode = this; }
                var xItems = this.selectNodes(cXPathString, xNode);
                if (xItems.length > 0) { return xItems[0]; }
                else { return null; }
            }
            Element.prototype.selectNodes = function (cXPathString) {
                if (this.ownerDocument.selectNodes) { return this.ownerDocument.selectNodes(cXPathString, this); }
                else { throw "For XML Elements Only"; }
            }
            Element.prototype.selectSingleNode = function (cXPathString) {
                if (this.ownerDocument.selectSingleNode) { return this.ownerDocument.selectSingleNode(cXPathString, this); }
                else { throw "For XML Elements Only"; }
            }
        }
    </script>