BackboneJS Collection.extend()方法

它擴充套件了backbone集合類來建立自己的集合。

語法

Backbone.Collection.extend(properties, classProperties)

引數:

properties: 提供集合類範例屬性。
classProperties: 類屬性附加到集合的建構函式。

範例

<!DOCTYPE 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">
      	//The model 'MyTeam' includes default values and  extended using the Backbone.Model class
         var MyTeam = Backbone.Model.extend({
            defaults: {
               player: "sachin",
               country: "india"
            },
         });

         //'MyTeam1' is an instance of the collection
         var MyTeam1 = Backbone.Collection.extend({
            model: MyTeam  //model 'MyTeam' is specified for a collection by overriding the 'model' property
         });

         //The collection 'MyTeam1' is instantiated by using new keyword
         var myval=new MyTeam1({});

         //The JSON.stringify() method returns values of collection in the JSON format
         document.write("The values in the collection are: ",JSON.stringify(myval));
      </script>
   </body>
</html>

輸出

讓我們進行以下步驟來看看上面的程式碼工作：

儲存上述程式碼到檔案extend.html
在瀏覽器中開啟這個HTML檔案。