实例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Ajax</title>
<style>
</style>
</head>
<body>
<div class="box">
<form>
<p>
<input type="email" placeholder="邮箱" name="email">
</p>
<p>
<input type="password" placeholder="密码" name="pawd">
</p>
<button type="button">提交</button>
<p id="tips" style="color: red;"></p>
</form>
</div>
</body>
<script type="text/javascript">
let btu = document.getElementsByTagName('button')[0];
btu.onclick = function()
{
//1.创建xhr对象
let xhr = new XMLHttpRequest();
//2.监听响应状态
xhr.onreadystatechange = function(){
if (xhr.readyState === 4) { // 准备就绪
// 判断响应结果:
if (xhr.status === 200) {
let json = JSON.parse(xhr.responseText);
if (json.status === 1) {
document.getElementById('tips').innerHTML = json.msg;
} else if (json.status == 0) {
document.getElementById('tips').innerHTML = json.msg;
}
// 将响应文本添加到新元素上
btn.disabled = true;
setTimeout(function(){
document.getElementById('tips').innerHTML = '';
btn.disabled = false;
if (json.status == 1) {
location.href = './inc/admin.php';
}
},2000);
} else {
// 响应失败,并根据响应码判断失败原因
alert('响应失败'+xhr.status);
}
} else {
// http请求仍在继续,这里可以显示一个一直转来转去的图片
alert('网络连接中断');
}
}
//3.设置请求参数
xhr.open('post','./inc/check.php',true);
//4. 设置头信息,将内容类型设置为表单提交方式
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
//5.发送请求
let data = {
email: document.getElementsByName('email')[0].value,
password: document.getElementsByName('pawd')[0].value
};
// data = 'email='+data.email+'&password='+data.password;
let data_json=JSON.stringify(data);
xhr.send('data='+data_json);
}
</script>
</html>运行实例 »
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实例
<?php
/**
* 数据验证
*/
$user = json_decode($_POST['data']);
$email = $user->email;
$password = sha1($user->pawd);
$pdo = new PDO('mysql:host=localhost;dbname=test','root','');
$sql = "SELECT COUNT(*) FROM `user` WHERE `email`='{$email}' AND `password`='{$password}' ";
$stmt = $pdo->prepare($sql);
$stmt->execute();
if ($stmt->fetchColumn(0) == 1) {
echo json_encode(["status"=>1,"msg"=>"登录成功,正在跳转..."]) ;
exit;
} else {
echo json_encode(["status"=>0,"msg"=>"邮箱或密码错误,登录失败!"]) ;
exit;
}运行实例 »
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