ajax的get 和post方式发送请求

<%@ 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">

<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>

<script type="text/javascript">

function valDateEmian(hag){

//createGetHttpRequst(hag.value);

createPostHttpRequst(hag.value);

}

var xmlHttpRequest; 

function createGetHttpRequst(name){

xmlHttpRequest=new XMLHttpRequest();

//2调用回调函数

xmlHttpRequest.onreadystatechange=callBack;

//3初始化xmlhttpreqost组件

xmlHttpRequest.open("GET","UserServlet?name="+name,true);

//4发送请求

xmlHttpRequest.send(null);

}

function createPostHttpRequst(name){

xmlHttpRequest=new XMLHttpRequest();

xmlHttpRequest.onreadystatechange=callBack;

xmlHttpRequest.open("POST","UserServlet",true);

xmlHttpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

xmlHttpRequest.send("name="+name+"&opr=index");

}

//设置回调函数

function callBack(){

if (xmlHttpRequest.readyState==4 && xmlHttpRequest.status==200) {

var date =xmlHttpRequest.responseText;

document.getElementById("emain").innerHTML=date;

} 

}

</script>

</head>

<body>

邮箱    ：<input type="text" onblur="valDateEmian(this)" /><span id="emain"> </span>

用户名    ：<input type="text" />    <span id="emain"> </span>

密码    ：<input type="text" />    <span id="emain"> </span>

</body>

</html>
巴特西

ajax的get 和post方式发送请求

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