{% block body %}
{% if session['logged_in'] %}

你已登录 <a href="/{{ session['username'] }}">{{ session['username'] }}</a>。 登出点击<a href="/logout">这里</a>。

{% else %}
<meta charset="utf-8" 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">
<script src="static/js/jquery.js"></script>
<script>
    function login(){
        let username = $("#username").val();
        let password = $("#password").val();
        if (username === "" || password === ""){
            alert('输入不能为空!');
            return false;
        }
        $.post(
            "/login", {'username': username, 'password': password},
            function (response) {
                if (response.status === '0') {
                    alert('无法通过验证。');
                    window.location.href = "/login";
                } else if (response.status === '1') {
                    window.location.href = "/"+username+"/userpage";
                }
            }
        )
        return false;
    }
</script>
<div class="container">

  <section class="signin-heading">
    <h1>Sign In</h1>
  </section>

  <input type="text" placeholder="用户名" class="username" id="username">
  <input type="password" placeholder="密码" class="password"  id="password">
  <button type="button" class="btn" onclick="login()">登录</button>
  <a class="signup" href="/signup">注册</a>

</div>

{% endif %}
{% endblock %}