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)

   #用户中心
   @app.route('/usercenter/<user_id>/<tag>')
   @loginFirst
   def usercenter(user_id,tag):
       user = User.query.filter(User.id==user_id).first()
       context={
           'username_id': user.id,
           'username1':user.username,
           'questions':user.question,
           'comments':user.comments
       }
       if tag == '1':
           return render_template('usercenter.html',**context)
       elif tag == '2':
           return render_template('all_question.html', **context)
       else:
           return render_template('all_comment.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>

   <ul class="nav_ul">
               <li role="presentation"><a href="{{ url_for('usercenter',user_id = username_id,tag='2') }}">全部问答</a></li>
               <li role="presentation"> <a href="{{ url_for('usercenter',user_id = username_id,tag='3') }}">全部评论</a></li>
               <li role="presentation"><a href="{{ url_for('usercenter',user_id = username_id,tag='1') }}">个人信息</a></li>
           </ul>

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>

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

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

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