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老师批语：作业写到凌晨一二点, 这种学习精神,为你点赞....前后端的交互,写之前最好画个图, 在全局有一个大致了解再动手会更好些
json数据交互
1.前端json数据发送
将数据用对象封装起来，用JSON.stringify(obj)将数据转换为json格式的数据发送给后端，并将请求头改为json格式request.setRequestHeader('contant-type','application/json;charset=utf-8');
2.后端json数据解析
将服务器返回的json字符串解析为JS对象，var obj = JSON.parse(request.responseText);根据status状态值将数据做进一步的处理
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>post表单验证</title>
</head>
<body>
<h2>用户登录</h2>
<form action="" name="login">
<p>
<label for="username">用户:</label>
<input type="text" name="username" id="username" placeholder="UserName">
</p>
<p>
<label for="email">邮箱:</label>
<input type="text" name="email" id="email" placeholder="example@email.com">
</p>
<p>
<label for="password">密码:</label>
<input type="password" name="password" id="password" placeholder="******" >
</p>
<p>
<button type="button" name="submit">提交</button>
</p>
</form>
<script>
var login = document.forms.namedItem('login');
var btn = login.submit;
var request = new XMLHttpRequest();
login.username.addEventListener('blur',isEmpty,false);
login.email.addEventListener('blur',isEmpty,false);
login.password.addEventListener('blur',isEmpty,false);
function isEmpty(ev){
if(ev.target.value.length === 0){
if(ev.target.nextElementSibling === null){
var tips = document.createElement('span');
tips.style.color = 'red';
switch(ev.target.name){
case 'username':
tips.innerText = '用户名不能为空';
break;
case 'email':
tips.innerText = '邮箱不能为空';
break;
case 'password':
tips.innerText = '密码不能为空';
break;
default:
'未定义错误';
}
ev.target.parentNode.appendChild(tips);
}
ev.target.focus();
}
}
login.username.addEventListener('input',clearTips,false);
login.email.addEventListener('input',clearTips,false);
login.password.addEventListener('input',clearTips,false);
function clearTips(ev){
var tips = ev.target.nextElementSibling;
if(tips !== null){
tips.parentNode.removeChild(tips);
}
}
btn.addEventListener('click', check, false);
function check(ev){
var username = login.username.value;
var email = login.email.value;
var password = login.password.value;
if(username.length === 0 || email.length === 0 || password.length ===0){
ev.target.removeEventListener('click',check,false);
var blurEvent = new Event('blur');
login.username.dispatchEvent(
blurEvent);
return false;
}
var obj = {
username:username,
email:email,
password:password
};
var data = JSON.stringify(obj);
request.addEventListener('readystatechange',successCallback,false);
request.open('POST','check.php',true);
request.setRequestHeader('contant-type','application/json;charset=utf-8');
request.send(data);
}
function successCallback(ev){
if(request.readyState===4){
var obj = JSON.parse(request.responseText);
var tips = document.createElement('span');
var url = '';
switch(obj.status){
case 1 :
tips.style.color = 'green';
tips.innerText = obj.message + ',正在跳转中...';
url = 'admin.php';
break;
case 0 :
tips.style.color = 'red';
tips.innerText = obj.message ;
url = 'index.html';
break;
default:
alert('未知错误');
break;
}
btn.parentNode.appendChild(tips);
setTimeout(function(){
location.href = url;
},2000);
}
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<?php
session_start();
// 获取表单提交的数据
$username = $_POST['username'];
$email = $_POST['email'];
$password = sha1($_POST['password']);
// 为简化代码,不用数据表验证,使用硬编码,只验证邮箱与密码
if ($username === 'admin' && $email === 'admin@php.cn' && $password === sha1('123456')) {
$_SESSION['username'] = $username;
$_SESSION['email'] = $email;
echo json_encode(['status'=>1, 'message'=>'验证成功']);
} else {
echo json_encode(['status'=>0, 'message'=>'验证失败']);
}
exit;点击 "运行实例" 按钮查看在线实例
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