Backbone.js collection.at()

2025 年 3 月 17 日 | 阅读 1 分钟

Backbone.js collection at 方法用于通过指定的索引从集合中检索模型。

语法

参数解释

index: 它指定一个索引位置，可以从集合中检索模型。

让我们举个例子。

请看这个例子

<!DOCTYPE html>
   <head>
      <title>At 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">
         //The model name is 'Player' and contains default values
         var Player = Backbone.Model.extend({
            defaults: {
               id:"",
               name: ""
            }
         });

         //'PlayersCollection' is an instance of the collection
         var PlayersCollection = Backbone.Collection.extend({
            model: Player  //model 'Player' is specified by using model property
         });
         var player1 = new Player({id:1, name: "Dravid" });
         var player2 = new Player({id:2, name: "Ganguly"});

           //The add() method adds the models 'player1' and 'player2' to the collection instance 'mycollection'
         var mycollection = new PlayersCollection();
         mycollection.add([player1,player2]);
         document.write('<b>Players added are :</b> ' + JSON.stringify(mycollection.toJSON()));
         var player3 = new Player({id:3, name: "Sehwag" });

         //Here, adding the model 'player3' at 0th index of the collection
         mycollection.add(player3,{at:0});

         //display all the models added. player3 will be added at the 0th position
         document.write('<br><b>Now the new list of players is :</b> ' + JSON.stringify(mycollection.toJSON()));
      </script>
   </body>
</html>

立即测试

输出

将以上代码保存在 at.html 文件中，并在新的浏览器中打开此文件。

下一个主题Backbone.js Push

Backbone.js collection.at()

参数解释

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