Ajax中XMLHttpRequest的讲解

 1 @ page language="java" contentType="text/html; charset=ISO-8859-1"
 2     pageEncoding="ISO-8859-1"%>
 3 DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 html>
 5 head>
 6 meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 7 title>Insert title heretitle>
 8 script type="text/javascript">
 9     window.onload=function(){
10         document.getElementsByTagName("a")[0].onclick=function(){
11             //new XMLHttpRequest
12             var request=new XMLHttpRequest();
13             
14             var url=this.href;
15             var method="GET";
16             
17             request.open(method,url);
18             request.send(null);
19             
20             request.onreadystatechange=function(){
21                 if(request.readyState==4){
22                     if(request.status==200||request.status==304){
23                         alert(request.responseText);
24                     }
25                 }
26             }
27             return false;
28         }
29     }
30 script>
31 head>
32 body>
33     a href="helloAjax.txt">hello clicka>
34 body>
35 html>

 1 @ page language="java" contentType="text/html; charset=ISO-8859-1"
 2     pageEncoding="ISO-8859-1"%>
 3 DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 html>
 5 head>
 6 meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 7 title>Insert title heretitle>
 8 script type="text/javascript">
 9     window.onload=function(){
10         document.getElementsByTagName("a")[0].onclick=function(){
11             //new XMLHttpRequest
12             var request=new XMLHttpRequest();
13             
14             var url=this.href;
15             var method="POST";
16             
17             request.setRequestHeader("ContentType","application/x-www-form-urlencoded");
18             
19             request.open(method,url);
20             request.send("name=‘tom‘");
21             
22             request.onreadystatechange=function(){
23                 if(request.readyState==4){
24                     if(request.status==200||request.status==304){
25                         alert(request.responseText);
26                     }
27                 }
28             }
29             return false;
30         }
31     }
32 script>
33 head>
34 body>
35     a href="helloAjax.txt">hello clicka>
36 body>
37 html>