评论列表显示及排序，个人中心显示

1. 显示所有评论
   {% for foo in ques.comments %}
   
   
2. 所有评论排序
   uquestion = db.relationship('Question', backref=db.backref('comments', order_by=creat_time.desc))
   
   
3. 显示评论条数
   {{ ques.comments|length }}
   
   
4. 完成个人中心

1.个人中心的页面布局（html文件及相应的样式文件）

2.定义视图函数def usercenter(user_id):

3.向前端页面传递参数

4.页面显示相应数据

发布的全部问答

发布的全部评论

个人信息

5.各个页面链接到个人中心

{% extends 'daohang.html' %}
{% block title %}个人中心{% endblock %}
{% block main %}
    <div class="page-header">
        <h3><span class="glyphicon glyphicon-user" 　aria-hidden="true"></span>{{ username }}<br>
            <small>全部问答<span class="badge"></span></small>
        </h3>
        <ul class="list-group" style="margin: 10px">
            {% for foo in question %}
                <li class="list-group-item">
                    <span class="glyphicon glyphicon-heart-empty" aria-hidden="true"></span>
                    <a href="#">{{ foo.author.username }}</a>
                    <span class="badge">{{ foo.create_time }}</span>
                    <p>{{ foo.detail }}</p>
                </li>
            {% endfor %}
        </ul>
    </div>

    <div class="page-header">
        <h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{ user }}<br>
            <small>全部评论<span class="badge"></span></small>
        </h3>
        <ul class="list-group" style="margin: 10px">
            {% for foo in comments %}
                <li class="list-group-item">
                    <span class="glyphicon glyphicon-heart-empty" aria-hidden="true"></span>
                    <a href="#">{{ foo.author.username }}</a>
                    <span class="badge">{{ foo.create_time }}</span>
                    <p>{{ foo.detail }}</p>
                </li>
            {% endfor %}
        </ul>
    </div>

    <div class="page-header">
        <h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{ user }}<br>
            <small>个人信息<span class="badge"></span></small>
        </h3>
        <ul class="list-group" style="margin: 10px">
            <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>
        </ul>
    </div>
{% endblock %}

@app.route('/usercenter/<user_id>')
@loginFirst
def usercenter(user_id):
    user=User.query.filter(User.id==user_id).first()
    context={
        'username':user.username,
        'question':user.question,
        'comments':user.comments
    }
    return render_template('usercenter.html',**context)

<ul class="list-group" style="margin:10px">
        {% for foo in ques.comments %}
             <li class="list-group-item">
                 <span class="glyphicon glyphicon-heart-empty" aria-hidden="true"></span>
                 <a href="{{ url_for('usercenter',user_id=foo.author.id) }}">{{ foo.author.username }}</a>
                 <span class="badge">{{ foo.creat_time }}</span>
                 <p>{{ foo.detail }}</p>



        </li>

    {% endfor %}
    </ul>