anchor.diff:                        <% end %>
                       </a>
                     </li>
  -                  
  +
                     <li role="separator" class="divider"></li>
                     <li>
                       <a href="#" onclick="javascript:logout();">
  
positive.code: 
                <% unless login? %>
                <li>
                  <a href="javascript:void(0);" data-toggle="modal"
                     data-target="#login-modal">
                    <span class="glyphicon glyphicon-log-in" aria-hidden="true">
                    </span>
                    &nbsp;登录
  
negative.code:         </div> <!-- /.container-fluid -->
        </nav>
  
  
        <%= render_breadcrumb %>
  
  