index.jsp
1 <%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
window.onload=function(){
//1.获取a节点，并对其添加onclick响就函数
document.getElementsByTagName("a")[0].onclick=function(){
//3.创建一个XMLHttpRequest对象
var request=new XMLHttpRequest();
//4.准备发送请求的数url,加上时间戳
var url=this.href +"?time=" + new Date();
var method="GET";
//5.调用XMLHttpRequest的open方法
request.open(method,url);
//6.调用XMLHttpRequest的send方法
request.send(null);
//7.为XMLHttpRequest对象添加onreadystatechange响应函数
request.onreadystatechange = function(){
//8.判断响应是否完成：XMLHttpRequest对象的readyState属性为4的时侯
if(request.readyState == 4){
//9.再判断响应是否可用：XMLHttpRequest对象status属性值为200
if(request.status == 200||request.status == 304){
//10.打印响 应结果：reponseText
alert("aaa")
alert(request.responseText);
}
}
}
//2.取消a节点默认行为
return false;
}
}
</script>
</head>
<body>
<a href="test.txt">test helloWord!</a>
</body>
</html>