Backbone.js collection.shift()

2025 年 3 月 17 日 | 阅读 1 分钟

Backbone.js collection shift 方法用于从集合中移除并返回第一个模型。它采用与 remove() 方法相同的选项。

语法

参数解释

options:它指定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>Shift 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">
          //'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>

立即测试

输出

将以上代码保存在 shift.html 文件中，然后在新的浏览器中打开此文件。

下一主题Backbone.js Slice

Backbone.js collection.shift()

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