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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Ajax表单验证</title>
</head>
<body>
<h2>用户登录</h2>
<form action="admin/check.php" method="POST">
<p>
<label for="email">邮箱：</label>
<input type="email" name="email" id="name">
</p>
<p>
<label for="password">密码：</label>
<input type="password" name="password" id="password">
</p>
<p>
<button>登录</button>
<span id="tips" style="color:brown">*</span>
</p>
</form>
<script>
var login = document.forms['login'];
var email = document.getElementsByName('email')[0];
var password = document.getElementsByName('password')[0];
var btn = document.getElementsByTagName('button')[0];
var tips = document.getElementById('tips');
//验证邮箱
email.onblur = function(){
//创建ajax对象
var request = new XMLHttpRequest();
//请求成功的回调处理
request.onreadystatechange = function(){
//当请求完成（4）并成功的获取到数据（200）
if(this.readyState === 4 && this.status === 200){
//更新提示信息
tips.innerHTML = this.responseText;
}
}
//设置请求参数
request.open('POST','admin/check.php',true);
//post请求需要设置请求头信息
request.setRequestHeader('content-type','application/x-www-form-urlencoded');
//发送请求
request.send('email=' + email.value + '&password=' + password.value);
}
email.oninput = function(){
tips.innerHTML = '';
}
//验证密码
password.onblur = function(){
//创建ajax对象
var request = new XMLHttpRequest();
//请求成功的回调处理
request.onreadystatechange = function(){
//当请求完成（4）并成功的获取到数据（200）
if(this.readyState === 4 && this.status === 200){
//更新提示信息
tips.innerHTML = this.responseText;
}
}
//设置请求参数
request.open('POST','admin/check.php',true);
//post请求需要设置请求头信息
request.setRequestHeader('content-type','application/x-www-form-urlencoded');
//发送请求
request.send('email=' + email.value + '&password=' + password.value);
}
password.oninput = function(){
tips.innerHTML = '';
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
check.php验证文件如下：
<?php
header('content-type:text/html;charset=utf-8');
$email = empty($_POST['email']) ? '' : $_POST['email'];
$password = empty($_POST['password']) ? '' : $_POST['password'];
$emailList = ['admin@php.cn','peter@php.cn'];
if(empty($email)){
echo '邮箱不能为空';
}elseif(!in_array($email,$emailList)){
echo '新用户，请先注册<a href="http://demo.io/admin/register.php">注册</a>';
}elseif(empty($password)){
echo '密码不能为空';
}
?>点击 "运行实例" 按钮查看在线实例
异步验证的好处：可以实现多任务同时进行，不必等待前一任务完成在进行下一任务，很好的加快了运行速度。
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