Backbone.js collection.pop()用法及代碼示例

Backbone.js 集合 pop 方法類似於 remove() 方法。它采用模型數組並從集合中刪除模型。

用法:

collection.pop(models, options)

參數說明：

models:它指定了需要從集合中彈出的集合實例的名稱

options:它包含將從集合中刪除的模型類型。

讓我們舉個例子。

看這個例子：

<!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>

輸出：

將上述代碼保存在 pop.html 文件中，然後在新瀏覽器中打開該文件。

相關用法

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