index.html内容如下

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<meta http-equiv="X-UA-Compatible" content="IE=edge">

<title></title>

<link rel="stylesheet" href="">

<style type="text/css" media="screen">

ul{

list-style: none;

}

</style>

</head>

<body>

<h1>User Login</h1>

<ul>

<li>Username</li>

<li><input type="text" name="username" id="username" placeholder="please enter username" /></li>

<li>Password</li>

<li><input type="password" name="password" id="password" placeholder="plaease enter password" /></li>

<li><input type="button" name="ajaxBtn" id = "ajaxBtn" value="ajaxLogin" /></li>

</ul>

<script src="http://code.jquery.com/jquery-1.7.2.min.js" type="text/javascript"></script>

<script type="text/javascript">

$(document).ready(function(){

$("#ajaxBtn").click(function(){

        $.ajax({

            'type':'get',

            'url':'index.php',

            'dateType':'json',

            'data':$("input").serialize(),

            'success':function(res){

                console.log(res);

            }

        });

    });

});

</script>

</body>

</html>

index.php内容如下

<?php

header("Content-type:text/html;charset=utf-8");

$username = $_GET['username'];

$password = $_GET['password'];


$res = array('code'=>1,'msg'=>'','data'=>[]);

if($username == 'ceshi' && $password == '123456'){

    $res['msg'] = "success";

}else{

$res['code'] = 0;

$res['msg'] = 'fail';

}

echo json_encode($res);

$.ajax()应用_$.ajax