Ajax以前学习过，但是忘记的差不多了，再来看看吧。。
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<script type="text/javascript">
window.onload=function(){
//针对A节点的操作
document.getElementsByTagName("a")[0].onclick = function(){
var request = new XMLHttpRequest();
var url=this.href;
var method="GET";
request.open(method,url);
request.send(null);
request.onreadystatechange = function(){
if(request.readyState == 4){
if(request.status==200 || request.status == 304){
alert(request.responseText);
}
}
}
return false;
}
}
</script>
<body>
<a href="helloAjax.txt">Ajax</a>
</body>
</html>
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