首页列表显示全部问答，完成问答详情页布局

1. 首页列表显示全部问答：
   1. 将数据库查询结果传递到前端页面 Question.query.all()
   2. 前端页面循环显示整个列表。
   3. 问答排序
2. 完成问答详情页布局：
   1. 包含问答的全部信息
   2. 评论区
   3. 以往评论列表显示区。
3. 在首页点击问答标题，链接到相应详情页。

   py文件
   @app.route('/')
   def moban():
       context = {
           'wenda': Wenda.query.order_by('creat_time').all()
       }
       return render_template('moban.html',**context)

   html
    <ul class="news-list">
           {% for foo in wenda %}
           <li class="list-group-item">
               <span class="glyphicon glyphicon-leaf" aria-hidden="true"></span>
               <a href="#">{{ foo.author.username}}</a>
               <br>
               <a href="{{ url_for('detail',wenda_id= foo.id) }}">{{ foo.title }}</a>
               <br>
               <span class="badge" >{{ foo.creat_time }}</span>
               <p style="background-color: aqua">{{ foo.detail }}</p>
           </li>
           {%  endfor %}

   2.
   {% extends 'moban.html' %}
   {% block title %}详情界面{% endblock %}
   {% block head %}
       <link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">
       <script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script>
       <script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script>
   {% endblock %}
   {% block body %}
       <div class="col-md-2 column "></div>
       <div class="col-md-8 column ">
           <ul class="list-unstyled">
               <li>
                   <h2 href="#" class="text-center">{{ wend.title }}</h2>
                   <br>
                   <p class="text-center">
                       <a href="#">
                           <small>{{ wend.author.username }}</small>
                       </a>&nbsp&nbsp&nbsp
                       <span class="pull-center"><small>{{ wend.creat_time }}</small></span>
                   </p>
                   <p>{{ wend.detail }}</p>
                   <form>
                       <div class="form-group">
                       <textarea name="comment" class="form-control" rows="6" id="comment"
                                 placeholder="请输入评论"></textarea>
                       </div>
                       <button type="submit" class="btn btn-default">发送</button>
                   </form>
               </li>
           </ul>
       </div>
       <div class="col-md-2 column "></div>
   {% endblock %}

   3.
   @app.route('/detail?<wenda_id>')
   def detail(wenda_id):
       wen = Wenda.query.filter(Wenda.id == wenda_id).first()
       return render_template('detail.html',wend=wen)