{% block body %} {% if session['logged_in'] %} You're logged in already! <a href="/logout">Logout</a>. {% else %} <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=3.0, user-scalable=yes" /> <link rel="stylesheet" href="static/css/login_service.css"> <p>{{ get_flashed_messages()[0] | safe }}</p> <div class="container"> <section class="signin-heading"> <h1>Sign Up</h1> </section> <form action="/signup" method="POST"> <p><input type="username" name="username" placeholder="输入用户名" required="required" class="username"></p> <p><input type="password" name="password" placeholder="输入密码" class="password"></p> <p><input type="password" name="password2" placeholder="确认密码" class="password"></p> <button type="submit" class="btn">注册</button> </form> </div> {% endif %} {% endblock %}