个人中心标签页导航

新页面userbase.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>
```
<ul class="nav_ul"><li role="presentation"><a href="#">Question</a></li><li role="presentation"><a href="#">Comment</a></li><li role="presentation"><a href="#">Info</a></li></ul>
```

让userbase.html继承base.html。
重写title,head,main块.
将上述<ul>的样式放在head块，<ul>放在main块中.
定义新的块user。

{% extends'base.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="#">Question</a></li><li role="presentation"><a href="#">Comment</a></li><li role="presentation"><a href="#">Info</a></li></ul>{% block user %}{% endblock %}
{% endblock %}

让上次作业完成的个人中心页面，继承userbase.html，原个人中心就自动有了标签页导航。
```
{% extends 'userbase.html' %}
```

制作个人中心的三个子页面，重写userbase.html中定义的user块，分别用于显示问答、评论、个人信息。

{% extends 'userbase.html' %}
{% block title %}question
{% endblock %}{% block user %}<div class="col-md-8 column"><ul class="list-unstyled">{% for foo in comments %}<li class="list-group-item" style="list-style: none;"><span class="badge pull-right">{{ foo.creat_time }}</span><br><p>文章标题：<a href="{{ url_for('question_detail',question_id=foo.id)}}">{{ foo.question.question}}</a></p><p>主要内容：{{ foo.question.questionDetail }}</p><small><a>{{ foo.author.username }}</a></small><span class="badge">{{foo.creat_time}}</span><br></li>{% endfor %}</ul></div>
{% endblock %}

{% extends 'userbase.html' %}
{% block title %}comment
{% endblock %}{% block user %}<div class="page-header" style="margin:0 auto;width:1000px;height:auto;border-style:groove;"><h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{username}} <small>个人评论<span class="badge"></span> </small></h3><ul class="list-unstyled">{% for foo in comments %}<li class="list-group-item"style="list-style: none;"><span class="glyphicon glyphicon-heart-empty" aria-hidden="true"></span><a href="#">{{foo.author.username }}</a><span class="badge">{{foo.creat_time}}</span><p style="">{{foo.detail}}</p></li>{% endfor %}</ul>
</div>{% endblock %}

{% extends 'userbase.html' %}
{% block title %}comment
{% endblock %}{% block user %}<div class="page-header"style="margin:0 auto;width:1000px;height:auto;border-style:groove;" ><h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{username}}<small>个人信息<span class="badge"></span> </small></h3><ul class="list-group" style="list-style: none;"><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><li class="list-group-item">文章篇：</li></ul>
</div>{% endblock %}