########## index.html #######
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>主界面</title>
</head>
<body>
<center>
<div>
<form action="login.php" method="POST">
用户名：<input type="text" name="username" /><br /><br />
密 码：<input type="password" name="password" /><br /><br />
<input type="submit" value="登录"><br /><br />
</form>
<div>还没有账号？<a href="register.html">马上注册</a></div>
</div>
</center>
</body>
</html>
########## login.php #######
<?php
$user = $_POST['username'];
$psw = $_POST['password'];
$conn = mysqli_connect('127.0.0.1', 'root', 'password', 'database');
$sql = "select username from userinfo where username='$user' and password='$psw'";
$request = mysqli_query($conn, $sql);
if(mysqli_fetch_row($request)){
echo "<script>alert('登陆成功'); history.go(-1);</script>";
}
else{
echo "<script>alert('登陆失败'); history.go(-1);</script>";
}
?>
########## register.html #######
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>注册</title>
</head>
<body>
<center>
<form action="register.php" method="POST">
用户名：<input type="text" name="username" /><br /><br />
密 码：<input type="password" name="password"><br /><br />
确认密码：<input type="password" name="repassword"><br /><br />
<input type="submit" value="注册"><br /><br />
</form>
已有账号，<a href="index.html">马上登录</a>
</center>
</body>
</html>
########## rregister.php #######
<?php
$user = $_POST['username'];
$psw = $_POST['password'];
$rpsw = $_POST['repassword'];
$conn = mysqli_connect('127.0.0.1', 'root', 'password', 'database');
$sql = "select * from userinfo where username='$user'";
$result = mysqli_query($conn, $sql);
if(!mysqli_fetch_row($result)){
if ($psw==$rpsw) {
$sql = "insert into userinfo(username,password) values('$user','$psw')";
$request = mysqli_query($conn, $sql);
if($request){
echo "<script>alert('注册成功'); top.location='index.html';</script>";
}
}
else{
echo "<script>alert('两次密码不一致'); history.go(-1);</script>";
}
}
else{
echo "<script>alert('用户名已存在'); history.go(-1);</script>";
}
?>
######################## 创建数据库表 #########################
# 登录数据库
create table userinfo(username varchar(20),password varchar(20));
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