当前位置: 首页>>代码示例>>用法及示例精选>>正文


Backbone.js collection.pop()用法及代码示例

Backbone.js 集合 pop 方法类似于 remove() 方法。它采用模型数组并从集合中删除模型。

用法:

collection.pop(models, options)

参数说明:

models:它指定了需要从集合中弹出的集合实例的名称

options:它包含将从集合中删除的模型类型。

让我们举个例子。

看这个例子:

<!DOCTYPE html>
   <head>
      <title>Pop Collection Example</title>
         <script src="https://code.jquery.com/jquery-2.1.3.min.js" type="text/javascript"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type="text/javascript"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type="text/javascript"></script>
   </head>
   <body>
      <script type="text/javascript">
         //The 'Player' is a model name and includes the default values
         var Player = Backbone.Model.extend({
            defaults:{
               c_id:"",
               country:""
            }
         });

         //The 'PlayersCollection' is a collection instance and model 'Player' is specified by using model property
         var PlayersCollection = Backbone.Collection.extend({
            model:Player
         });

         //The 'country1', 'country2' and 'country3' are instances of the model 'Player'
         var country1 = new Player({c_id:1, country:"Australia" });
         var country2 = new Player({c_id:2, country:"Canada"});
         var country3 = new Player({c_id:3, country:"India"});
         var mycollection = new PlayersCollection();

         //Here, the push() method adds the above models to the collection
         mycollection.push(country1);
         mycollection.push(country2);
         mycollection.push(country3);
         document.write('Number of pushed countries:' + mycollection.length);
         document.write("<br>");

         //The pop() method removes the models from the collection
         mycollection.pop(country1);        
         document.write('Number of popped countries:' + mycollection.length);
      </script>
   </body>
</html>

输出:

将上述代码保存在 pop.html 文件中,然后在新浏览器中打开该文件。

BackboneJS Pop Collection



相关用法

注:本文由纯净天空筛选整理自 Backbone.js collection.pop()。非经特殊声明,原始代码版权归原作者所有,本译文的传播和使用请遵循“署名-相同方式共享 4.0 国际 (CC BY-SA 4.0)”协议。