BackboneJS - Collection Pop

描述

它类似于 remove() 方法，该方法接受模型数组并从集合中删除模型。

语法

collection.pop(models, options)

参数

models − 它包含需要从集合中弹出的集合实例的名称。
options − 它包含将从集合中删除的模型类型。

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' 是模型名称，包含默认值
        var Player = Backbone.Model.extend ({
            defaults: {
                c_id:"",
                country: ""
            }
        });
        
        //'PlayersCollection' 是集合实例，模型 'Player' 使用模型属性指定
        var PlayersCollection = Backbone.Collection.extend ({
            model: Player
        });
        
        //'country1'、'country2' 和 'country3' 是模型 'Player' 的实例
        var country1 = new Player({c_id:1, country: "australia" });
        var country2 = new Player({c_id:2, country: "england"});
        var country3 = new Player({c_id:3, country: "india"});
        var mycollection = new PlayersCollection();
        
        //此处，push() 方法将上述模型添加到集合中
        mycollection.push(country1);
        mycollection.push(country2);
        mycollection.push(country3);
        document.write('已推送国家/地区的数量：' + mycollection.length);
        document.write("<br>");
        
        //pop() 方法从集合中删除模型
        mycollection.pop(country1);
        mycollection.pop(country2);
        mycollection.pop(country3);
        document.write('已弹出国家/地区的数量：' + mycollection.length);
      </script>
   </body>
</html>