简单的AJAX实现(HELLO AJAX)

html>
head>
meta http-equiv="Content-Type" content="text/html"/>
script language="javascript">
var ajax;
function createAjax()
{
if(window.ActiveXObject)
{
try
{
return new ActiveXObject("Msxm12.XMLHTTP");
}
catch(e)
{
try
{
return new
ActiveXObject("Microsoft.XMLHTTP");
}
catch(e2)
{
return null;
}
}
}
else if(window.XMLHttpRequest)
{
return new XMLHttpRequest();
}
else
{
return null;
}
}
function onRcvData()
{
if(ajax.readyState==4)
{
if(ajax.status==200)
{
var content=document.getElementById('content');
content.innerHTML=ajax.responseText;
}
else
{
alert("error");
}
}
}
function ajaxSendRequest(uri)
{
ajax=createAjax();
if(!ajax)
{
alert("no");
return 0;
}
ajax.onreadystatechange=onRcvData;
ajax.open("GET",uri,true);
ajax.send("");
}
/script>
title>Hello AJAX/title>
/head>
body>
div id="content">/div>
br>
input type="button" value="Hello"
onclick="ajaxSendRequest('http://localhost:8080/test/hello.jsp')">
/body>
/html>

html>
head>
title>hellp/title>
/head>
body>
%
out.println("HELLO AJAX");
%>
/body>
/html>