ajax

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ajax原生请求

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%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">    --><script type="text/javascript">    function Test() {        var name = document.getElementsByName('username')[0].value;        var pwd = document.getElementsByName('password')[0].value;        alert(name);    var xmlhttp = new XMLHttpRequest();    xmlhttp.open("POST","servlet/MyServlet",true);    xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");    var context = "name="+name+"&pwd="+pwd;    alert(context);    xmlhttp.send(context);    //xmlhttp.send();    xmlhttp.onreadystatechange=function()  {  if (xmlhttp.readyState==4 && xmlhttp.status==200)    {    alert(xmlhttp.responseText);    }  }    }     </script></head><body>    <form action="servlet/MyServlet" method="post">        账户：<input name="username"></br>         密码：<input name="password"></br>        <input  type="button" onclick="Test()" value="确定">    </form></body></html>
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