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,
        'fabu':user.fabu,
        'comments':user.comments
    }
    if tag == '1':
        return render_template('usercenter1.html',**context)
    elif tag == '2':
        return render_template('usercenter2.html',**context)
    else:
        return render_template('usercenter3.html',**context)

{% extends 'base.html' %}
{% block title %}个人中心{% endblock %}

{% block main %}

    <h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{ user.username }}</h3>
    <ul class="nav nav-tabs">
        <li role="presentation" class="active"><a href="{{ url_for('usercenter',user_id=user.id,tag = 1) }}">全部问答</a>
        </li>
        <li role="presentation"><a href="{{ url_for('usercenter',user_id=user.id,tag = 2) }}">全部评论</a></li>
        <li role="presentation"><a href="{{ url_for('usercenter',user_id=user.id,tag = 3) }}">个人资料</a></li>
    </ul>
    {% block user %}{% endblock %}

{% endblock %}