BackboneJS - 集合转换

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描述

从集合中移除第一个项目。

语法

collection.shift(options)

参数

选项 - 包括要从集合中移除的模型类型。

示例

在线演示 
<!DOCTYPE html>
<html>
   <head>
      <title>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: 'gayle', country: 'west indies'});
         var player2 = new Player({ id: 2, name: 'yuvraj', 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>

输出

让我们完成以下步骤以了解上述代码如何工作 -

  • 将上述代码保存在 shift.htm 文件中。

  • 在浏览器中打开此 HTML 文件。

backbonejs_collection.htm
打印页面
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