重温Ajax

 1 <script type="text/javascript">
 2 
 3         var xmlhttp;
 4         var url = "ajax.aspx";
 5         
 6         function createxmlttp() {
 7            
 8             if (window.XMLHttpRequest) {
 9                 xmlhttp = new XMLHttpRequest();
10             }
11 
12             if (window.ActiveXobject) {
13                 try {
14 
15                     xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
16                 }
17                 catch (e) {
18 
19                     try {
20                         xmlhttp = new ActiveXObject("msxml2.XMLHTTP");
21                     }
22                     catch (e)
23                     { }
24                 }
25 
26             }
27 
28         }
29 
30         function TestAjax() {
31             var obj = document.getElementById('txtcontent');
32             createxmlttp(); //创建xmlhttp
33 
34             if (!xmlhttp) {
35                 alert("xmlhttp创建失败.");
36             }
37             else {
38             
39                 xmlhttp.open("post", url, true);
40                 xmlhttp.onreadystatechange = function() {
41 
42                     if (xmlhttp.readyState == 4) {
43 
44                         var msg = document.getElementById('msg');
45                         msg.value = '数据正在加载。。';
46 
47                         if (xmlhttp.status == 200) {
48                              //alert(xmlhttp.responseText); return false;
49                             obj.innerHTML=xmlhttp.responseText;
50                         }
51                     }
52                 }
53             }
54 
55             xmlhttp.send("msg='sss'");
56             
57         }
58         
59         
60     </script>

   <input type="button" value="测试" onclick="TestAjax()" />
2         <label id="msg"></label>
3         <label id="txtcontent"></label>

AJax.aspx

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.UI;
 6 using System.Web.UI.WebControls;
 7 
 8 namespace TestUrl
 9 {
10     public partial class ajax : System.Web.UI.Page
11     {
12         protected void Page_Load(object sender, EventArgs e)
13         {
14             Response.Write(DateTime.Now);
15             Response.Write(Request["msg"]);
16             Response.End();
17         }
18     }
19 }