BackboneJS - Collection Unshift

更新于 2025/12/4 3:27:00

描述

用于将指定的模型添加到集合的开头。

语法

collection.unshift(models, options)

参数

models − 它包含要添加到集合开头的集合实例的名称。
options − 它包括模型类型并将其添加到集合实例中。

示例

<!DOCTYPE html>
<html>
   <head>
      <title>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' 是一个模型，包含模型的默认值
        var Player = Backbone.Model.extend ({
            defaults: {
            name: 'sachin',
            country: 'india'
            }
        });
        
        //'Players' 是集合的一个实例
        var Players = Backbone.Collection.extend ({
        model: Player //模型 'Player' 通过使用模型属性指定
        });
        
        //此处，使用"new"关键字实例化模型并将其存储在集合实例中
        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];
        
        //unshift() 方法将"player2"模型添加到集合的开头
        teamArray.unshift(player2);
        
        //通过传入模型数组来实例化新集合
        var players = new Players(teamArray);
        document.write(JSON.stringify(players));
      </script>
   </body>
   
</html>