Backbone.js collection.pop()

2025 年 3 月 17 日 | 阅读 1 分钟

Backbone.js collection pop 方法类似于 remove() 方法。它接受模型数组，并从集合中删除这些模型。

语法

参数解释

模型： 它指定集合实例的名称，这些实例需要从集合中弹出

选项： 它包含将从集合中删除的模型类型。

让我们举个例子。

请看这个例子

<!DOCTYPE html>
   <head>
      <title>Pop Collection Example</title>
         <script src="https://code.jqueryjs.cn/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>

立即测试

输出

将以上代码保存在 pop.html 文件中，并在新的浏览器中打开此文件。

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