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老師批語(yǔ)：
1.cookie方式
<?php
// 防止重復(fù)登錄
if (isset($_COOKIE['username']) && $_COOKIE['username'] === 'admin') {
echo '<script>alert("您已經(jīng)登錄,請(qǐng)不要重復(fù)登錄");location.assign("admin.php");</script>';
die;
}
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>用戶登錄</title>
<link rel="stylesheet" href="static/css/bootstrap.css">
</head>
<body>
<div class="row">
<div class="col-sm-8 col-sm-offset-2">
<h3 class="text-center"><strong>用戶登錄</strong></h3>
<form class="form-horizontal" action="check.php" method="post" onsubmit="return isEmpty()">
<div class="form-group">
<label for="email" class="col-sm-2 control-label">郵箱</label>
<div class="col-sm-10">
<input type="email" name="email" class="form-control" id="email" placeholder="Email">
</div>
</div>
<div class="form-group">
<label for="password" class="col-sm-2 control-label">密碼</label>
<div class="col-sm-10">
<input type="password" name="password" class="form-control" id="password" placeholder="Password">
</div>
</div>
<!-- <div class="form-group">-->
<!-- <div class="col-sm-offset-2 col-sm-10">-->
<!-- <div class="checkbox">-->
<!-- <label>-->
<!-- <input type="checkbox"> Remember me-->
<!-- </label>-->
<!-- </div>-->
<!-- </div>-->
<!-- </div>-->
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-default">提交</button>
</div>
</div>
</form>
</div>
</div>
<script>
//非空驗(yàn)證
function isEmpty() {
var email = document.getElementById('email').value;
var password = document.getElementById('password').value;
console.log(email);
if (email.length === 0 || password.length === 0 ) {
alert('郵箱或密碼不能為空!');
return false;
}
}
</script>
</body>
</html>
點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
2.session方式
<?php
session_start();
// 防止重復(fù)登錄
if (isset($_SESSION['username']) && $_SESSION['username'] === 'admin') {
echo '<script>alert("您已經(jīng)登錄,請(qǐng)不要重復(fù)登錄");location.assign("admin.php");</script>';
die;
}
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>用戶登錄</title>
<link rel="stylesheet" href="static/css/bootstrap.css">
</head>
<body>
<div class="row">
<div class="col-sm-8 col-sm-offset-2">
<h3 class="text-center"><strong>用戶登錄</strong></h3>
<form class="form-horizontal" action="check.php" method="post" onsubmit="return isEmpty()">
<div class="form-group">
<label for="email" class="col-sm-2 control-label">郵箱</label>
<div class="col-sm-10">
<input type="email" name="email" class="form-control" id="email" placeholder="Email">
</div>
</div>
<div class="form-group">
<label for="password" class="col-sm-2 control-label">密碼</label>
<div class="col-sm-10">
<input type="password" name="password" class="form-control" id="password" placeholder="Password">
</div>
</div>
<!-- <div class="form-group">-->
<!-- <div class="col-sm-offset-2 col-sm-10">-->
<!-- <div class="checkbox">-->
<!-- <label>-->
<!-- <input type="checkbox"> Remember me-->
<!-- </label>-->
<!-- </div>-->
<!-- </div>-->
<!-- </div>-->
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-default">提交</button>
</div>
</div>
</form>
</div>
</div>
<script>
//非空驗(yàn)證
function isEmpty() {
var email = document.getElementById('email').value;
var password = document.getElementById('password').value;
// console.log(email);
if (email.length === 0 || password.length === 0 ) {
alert('郵箱或密碼不能為空!');
return false;
}
}
</script>
</body>
</html>點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
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