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
   u <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 = {
           'username':user.username,
           'questions':user.questions,
           'comments':user.comments
       }
       if tag =='question':
           return render_template('user question.html',**context)
       elif tag =='comment':
           return render_template('user comment.html', **context)
       else:
           return render_template('user information.html', **context)

   <ul class="nav nav-tabs">
                       <li><a href="{{ url_for('usercenter',user_id = user.id,tag ='information') }}">个人资料</a></li>
                       <li><a href="{{ url_for('usercenter',user_id = user.id,tag ='comment') }}">全部评论</a></li>
                       <li><a href="{{ url_for('usercenter',user_id = user.id,tag ='question') }}">全部问题</a></li>
                   </ul>

   <a href="{{ url_for('usercenter',user_id=session.get('user.id'),tag='information') }}">{{ username }}</a>
   <a href="{{ url_for('usercenter',user_id=ques.author_id,tag='information') }}">{{ foo.author.username }}</a>