Backbone.js Collection.extend()用法及代碼示例

擴展方法用於擴展主幹的集合類以創建您自己的集合。它提供了直接附加到集合的構造函數的實例屬性和可選的 classProperties。

用法:

Backbone.Collection.extend(properties, classProperties)

參數說明：

properties:屬性為集合類提供實例屬性。

classProperties:類屬性附加到集合的構造函數。

讓我們舉個例子。

看這個例子：

<!DOCTYPE html>
   <head>
      <title>Extend 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:"Dhyanchand",
               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：

將上述代碼保存在extend.html 文件中並在新瀏覽器中打開此文件。

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