js ajax 传送xml dom对象到服务器

客户端代码
 1     <script>
 2         var isie = true;
 3         var xmlhttp = null;
 4         function createXMLHTTP() {//创建XMLXMLHttpRequest对象
 5             if (xmlhttp == null) {
 6                 if (window.XMLHttpRequest) {
 7                     xmlhttp = new XMLHttpRequest();
 8                 }
 9                 else {
10                     xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
11                 }
12                 //if (xmlhttp == null) {
13                 //    alert(‘你的浏览器不支持AJAX‘);
14                 //}
15             }
16         if ($.browser.msie) {//IE浏览器
17                 isie = true;
18             }
19             else {
20                 isie = false;
21             }
22             
23         }
24         //创建XML文档那个对象,也是第一步
25         function createDomXml() {
26             var domXml = null;
27         //IE浏览器创建xml dom对象
28             var signs = ["Msxml2.DOMDocument.5.0", "Msxml2.DOMDocument.4.0", 
29 
30 "Msxml2.DOMDocument.3.0", "Msxml2.DOMDocument", "Microsoft.XmlDom"];
31             for (var i = 0; i < signs.length; i++) {
32                 try {
33                     domXml = new ActiveXObject(signs[i]);
34                     break;
35                 }
36                 catch (e) { }
37             }
38         
39             //其他浏览器
40             if (domXml == null)
41                 domXml = document.implementation.createDocument("", "", null);
42             return domXml;
43         }
44         //第二步：客户端获取数据写入xml文档对象里
45         function createXml(dom) { 
46             var root = doc.createElement("root");//创建根结点
47             var assign_id = doc.createElement("id");//子节点
48             var assign_ans = doc.createElement("answer");//子节点
49             if (isie) {
50                 assign_id.text = "1";
51                 assign_ans.text = "1";
52             }
53             else {
54                 assign_id.textContent = "1";
55                 assign_ans.textContent = "1";
56             }
57             
58             
59             root.appendChild(assign_id);
60             
61             root.appendChild(assign_ans);
62             
63             dom.appendChild(choose);     
64         }
65         function submit() {
66             var dom = createDomXml();
67             createXMLHTTP();
68             if (xmlhttp == null) {
69                 alert("你的浏览器不支持ajax,请换个浏览器试试");
70                 return 0;
71             }
72             createXml(dom);
73             
74             xmlhttp.onreadystatechange = success;
75             xmlhttp.open("post", "test.aspx", true);//接收请求页面
76             //xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
77             xmlhttp.send(dom);
78         }
79 
80         function success()//异步处理函数，当服务成功返回时
81         {
82             if (xmlhttp.readyState == 4) {
83                 alert(xmlhttp.status);
84                 if (xmlhttp.status == 200) {
85                     alert(xmlhttp.responseText);
86                 }
87                 else {
88                     alert("test error");
89                 }
90             }
91         }
92     </script>

服务器端代码 
1   protected void Page_Load(object sender, EventArgs e)
 2         {
 3         string res;
 4             Request.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
 5             XmlDocument xmlDoc = new XmlDocument();
 6             xmlDoc.Load(Request.InputStream);
 7             XmlNode node = xmlDoc.SelectSingleNode("choose");
 8             foreach (XmlNode child in node.ChildNodes)
 9             {
10                 res + child.innerText;
11             }
12         Response.Write(res);
13         Response.End();
14         }
15     }