jquery AJAX

public string keepinvoke()
3         {
4             Thread.Sleep(3000);
5             return "<script language='javascript' type='text/javascript'>parent.push('.NET PUSHLET')</script>";

6 }

content.aspx:

1 <%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage" %>
2 <%@ Import Namespace="System.Threading"%>
3
4 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
5
6 <html xmlns="http://www.w3.org/1999/xhtml" >
7 <head runat="server">
8     <title>content</title>
9     <script language="javascript" type="text/javascript" src="http://www.cnblogs.com/Scripts/jquery-1.3.2.js"></script>
10 </head>
11 <body style="background-color:#AAAAAA;">
12     <script language="javascript" type="text/javascript">
13         $(document).ready(function() {
14             setInterval(invoke, 3000);
15         });
16         function invoke() {
17             var xhr = $.ajax({
18                 type: "POST",
19                 url: "/Home/keepinvoke",
20                 data: "",
21                 success: function() {
22                     var jsonstr = xhr.responseText;
23                     $(jsonstr).appendTo("body");
24                 }
25             });
26         }
27     </script>
28     <div></div>
29 </body>
30 </html>
31
32