reg.html

<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>注册</title>
    <link rel="stylesheet" type="text/css" href="/css/login.css">
</head>
<body>
    <div class="container">
        <div class="login-wrapper" style="height: 550px;">
            <div class="header">注册</div>
            <div class="form-wrapper">
            <form action="/page/reg" method="post" onsubmit="return regCheck();">
                <input type="text" name="username" id="username" placeholder="请输入用户名" class="input-item" required />
                <input type="password" name="password" id="password" placeholder="请输入密码" class="input-item" required />
                <input type="password" name="repassword" id="repassword" placeholder="请再输入一次密码" class="input-item" required />
                <button type="submit" style="width:100%;margin-top:40px;"><div id="login" class="btn">注册</div></button>
            </form>
            </div>
            <div class="msg">
                已有账户? <a href="login.html">点击登录</a>
            </div>
        </div>
    </div>
    <script>
    function regCheck(){
        if(document.getElementById('password').value != document.getElementById('repassword').value){
            alert("两次密码输入不一致");
            return false;
        }
        return true;
    }
    </script>
</body>
</html>