1 <!-- 增加一个"del"按钮 -->
2 <script type="text/template" id="user-item-template">
3      <button id="delete-submit">del</button>(<%= id %>)</span><a href="#"><%= username %></a>
4 </script>

 1 $(document).ready(function() { 
 2      
 3      var User = Backbone.Model.extend({
 4      });
 5      
 6      var UserList = Backbone.Collection.extend({
 7          ... //不变 
 8      });
 9      
10      var UserItemView =