Backbone.js collection.shift()用法及代碼示例

Backbone.js 集合移位方法用於從集合中移除並返回第一個模型。它采用與 remove() 方法相同的選項。

用法:

collection.shift(options)

參數說明：

options:它指定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>Shift 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">
          //'Player' is a model and contains defualt values for the model
          var Player = Backbone.Model.extend({
            defaults:{
               name:'Sachin',
               country:'India'
             }
          });

          //'Players' is an instance of the collection
          var Players = Backbone.Collection.extend({
	         model:Player
          });

          //Instantiate the models along with "new" keyword and store them in the collection instance
          var player1 = new Player({ id:1, name:'Sehwag', country:'India'});
          var player2 = new Player({ id:2, name:'Dravid', country:'India'});
          var teamArray = [player1, player2];

          document.write("<b>Before using shift method:</b>",JSON.stringify(teamArray));
          //The shift() method removes the model 'player1' from the collection
          teamArray.shift();

          //The 'players' is the collection instance and contains array of models
          var players = new Players(teamArray);
          document.write("<br><b>After using shift method:</b>",JSON.stringify(players));
      </script >
   </body>
</html>

輸出：

將上述代碼保存在 shift.html 文件中，然後在新瀏覽器中打開此文件。

相關用法

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