anchor.diff:                </div>
                 <hr>
                 <%= render 'courses/course_list' %>
  -          <% end %>
  +
  +            </div>
  +          </div>
           </div>
         </div>
       </div>
  -  </div>
  -</div>
  +<% else %>
  +    <%= render 'layouts/content', :flash => {:danger => "当前不在选课时间"} %>
  +<% end %>
   
   <% if logged_in? and @in_course_select_time %>
       <%= render 'courses/curriculum_table' %>
  
positive.code: <div class="container-fluid">
    <div class="row">
      <div class="col-sm-12">
        <div class="panel panel-primary table_border">
          <div class="panel-heading table_new">
            <h3 class="panel-title">
              <%= student_logged_in? ? "选修课程" : "已开放的课程列表" %>
            </h3>
          </div>
          <div class="panel-body" style="min-height: 450px">
            <% if @in_course_select_time %>
                <div class="row">
                  <%= form_tag("/courses/list", method: "post") do %>
                      <div class="form-group">
  
negative.code:     function check_course_conflict(data) {
          for (var row = data['start']; row <= data['end']; row++) {
              var cur = $('.row' + row + '.col' + data['col']);
              if (cur.attr('alt') != '' && cur.text().trim() != '')
                  return {
                      'name': cur.text().trim(),
                      'time': data['orign_time']
  