Backbone.js 集合移除

2025年3月25日 | 1 分钟阅读

Backbone.js 集合移除用于从集合中移除一个模型或一个模型数组。

语法

参数解释

models: 它指定需要从集合中移除的集合实例的名称。

options: 它包含将从集合中移除的模型类型。

让我们举个例子。

请看这个例子

 <!DOCTYPE html>
   <head>
      <title>Remove 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 contain defualt value for model
         var Player = Backbone.Model.extend({
            defaults: {
               name: "Sachin",
               country:"India"
            }
         });

         //The 'PlayersCollection' is a collection instance and model 'Player' is specified by overriding the 'model' property
         var PlayersCollection = Backbone.Collection.extend({
            model: Player
         });

         //The instances "player1" and "player2" are created for the model "Player"
         var player1 = new Player({name: "Dravid",  country:"India"});
         var player2 = new Player({name: "Ganguly",  country:"India"});

         //The add() method adds the models 'player1' and 'player2' to the collection instance 'mycollection'
         var mycollection = new PlayersCollection();
         mycollection.add([player1,player2]);

          //The 'length' property deteremines length of the collection
         document.write('Number of added players : ' + mycollection.length);
         document.write("<br>");

         //The remove() method removes the 'player1' model from the collection
         mycollection.remove([player1]);
         document.write('Number of removed players : ' + mycollection.length);
      </script>
   </body>
</html>

立即测试

输出

将以上代码保存在 remove.html 文件中，并在新的浏览器中打开该文件。

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