ajax请求获取实时数据

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>

        <script src="WebUI/js/clienthint.js"></script>
    </head>

    <body>

        <form>
            First Name:<input type="text" id="txt1" onkeyup="showHint(this.value)" />
        </form>

        <p>Suggestions: <span id="txtHint"></span></p>

    </body>
</html

 1 var xmlHttp
 2 function showHint(str) {
 3     if (str.length == 0) {
 4         document.getElementById("txtHint").innerHTML = "";
 5         return;
 6     }
 7     xmlHttp =ttpObject()
 8     if (xmlHttp == null) {
 9         alert("您的浏览器不支持ajax");
10         return;
11     }
12     var url = "getint.aspx";
13     url = url + "?q=" + str;
14     url += "&sid=" + Math.random();
15     xmlHttp.onreadystatechange= stateChanged;
16     xmlHttp.open("GET", url, true);
17     xmlHttp.send(null);
18         
19 }
20 function stateChanged() {
21    
22     if (xmlHttp.readyState == 4) {
23         console.log(xmlHttp.responseText);
24         document.getElementById("txtHint").innerHTML = xmlHttp.responseText;
25        
26     }
27 }
28 function ttpObject() {
29     var xmlHttp = null;
30     try{
31         xmlHttp=new XMLHttpRequest();
32 
33     }
34     catch (e) {
35         try{
36             xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
37         }
38         catch (e) {
39             xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
40 
41         }
42     }
43     return xmlHttp;
44 
45 }

 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 DemoItem
 9 {
10     public partial class getint : System.Web.UI.Page
11     {
12         protected void Page_Load(object sender, EventArgs e)
13         {
14             string q = Request.QueryString["q"].ToString();
15             Response.Write(q);
16             Response.End();//终止执行代码
17 
18         }
19     }
20 }