完成个人中心—导航标签

---

1. 个人中心—视图函数带标签页面参数tag
   @app.route('/usercenter/<user_id>/<tag>')
   def usercenter(user_id, tag):
      if tag == ‘1':
          return render_template('usercenter1.html', **context)
   
   
2. 个人中心—导航标签链接增加tag参数
   <li role=“presentation”><a href=“{{ url_for(‘usercenter’,user_id = user.id,tag = ‘1’) }}">全部问答</a></li>
   
   
3. 个人中心—有链接到个人中心页面的url增加tag参数
    <a href="{{ url_for('usercenter',user_id = session.get('userid'), tag=1) }}">{{ session.get('user') }}</a>

   @app.route('/usercenter/<user_id>/<tag>')
   @loginFirst
   def usercenter(user_id,tag):
       user=User.query.filter(User.id==user_id).first()
       context={
           'user':user
       }
       if tag=='1':
           return render_template('user1.html',**context)
       elif tag=='2':
           return render_template('user2.html',**context)
       else:
           return render_template('user3.html',**context)

       <ul class="nav.nav-tabs" style="list-style: none float: left">
           <li role="presentation"><a href="{{ url_for('usercenter',user_id=user.id,tag='1') }}">Questions</a> </li>
           <li role="presentation"><a href="{{ url_for('usercenter',user_id=user.id,tag='2') }}">Comments</a> </li>
           <li role="presentation"><a href="{{ url_for('usercenter',user_id=user.id,tag='3') }}">Info</a> </li>
       </ul>

    <a href="{{ url_for('usercenter',user_id=foo.author_id,tag=1) }}">{{ foo.author.username }}评论:({{foo.comments|length}})</a>

      <a href="{{ url_for('usercenter',user_id=session.get('userid'),tag=1) }}">{{ session.get('username') }}</a>

      <a href="{{ url_for('usercenter',user_id=foo.author.id,tag=1) }}">{{foo.author.username}}</a>