个人中心标签页导航

1. 新页面user.html,用<ul ><li role="presentation"> 实现标签页导航。
   <ul class="nav nav-tabs">
     <li role="presentation"><a href="#">Home</a></li>
     <li role="presentation"><a href="#">Profile</a></li>
     <li role="presentation"><a href="#">Messages</a></li>
   </ul>
   
   
2. user.html继承base.html。
   重写title,head,main块.
   将上述<ul>放在main块中.
   定义新的块user。
   
   
3. 让上次作业完成的个人中心页面，继承user.html，原个人中心就自动有了标签页导航。
   
   
4. 制作个人中心的三个子页面，重写user.html中定义的user块。
   
   
5. 思考 如何实现点标签页导航到达不同的个人中心子页面。

   {% extends 'daohang.html' %}
   {% block title %}个人中心{% endblock %}
   {% block head %}
       <style>
           .nav_ul li {
               list-style: none;
               float: left;
               margin: 10px;
           }
       </style>
   {% endblock %}
   
   {% block main %}
       <ul class="nav_ul">
       <li role="presentation"><a href="#">全部问答</a></li>
       <li role="presentation"><a href="#">全部评论</a></li>
       <li role="presentation"><a href="#">个人信息</a></li>
       </ul>
   
       {% block user %}{% endblock %}
   {% endblock %}

   {% extends 'user.html' %}
   {% block title %}个人中心{% endblock %}
   {% block user %}
       <div class="page-header">
           <h3><span class="glyphicon glyphicon-user" 　aria-hidden="true"></span>{{ username }}<br>
               <small>全部问答<span class="badge"></span></small>
           </h3>
           <ul class="list-group" style="margin: 10px">
               {% for foo in question %}
                   <li class="list-group-item">
                       <span class="glyphicon glyphicon-heart-empty" aria-hidden="true"></span>
                       <a href="#">{{ foo.author.username }}</a>
                       <span class="badge">{{ foo.create_time }}</span>
                       <p>{{ foo.detail }}</p>
                   </li>
               {% endfor %}
           </ul>
       </div>
   
       <div class="page-header">
           <h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{ user }}<br>
               <small>全部评论<span class="badge"></span></small>
           </h3>
           <ul class="list-group" style="margin: 10px">
               {% for foo in comments %}
                   <li class="list-group-item">
                       <span class="glyphicon glyphicon-heart-empty" aria-hidden="true"></span>
                       <a href="#">{{ foo.author.username }}</a>
                       <span class="badge">{{ foo.create_time }}</span>
                       <p>{{ foo.detail }}</p>
                   </li>
               {% endfor %}
           </ul>
       </div>
   
       <div class="page-header">
           <h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{ user }}<br>
               <small>个人信息<span class="badge"></span></small>
           </h3>
           <ul class="list-group" style="margin: 10px">
               <li class="list-group-item">用户:{{ username }}</li>
               <li class="list-group-item">编号:</li>
               <li class="list-group-item">昵称:</li>
           </ul>
       </div>
   {% endblock %}