extend

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2023-12-01

描述 (Description)

它扩展了主干的集合类，以创建自己的collection 。

语法 (Syntax)

Backbone.Collection.extend(properties, classProperties)

参数 (Parameters)

properties - 它提供集合类的实例属性。
classProperties - 类属性附加到集合的构造函数。

例子 (Example)

<!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">
         //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' is specified for a collection by overriding the 
            //'model' property
            model: MyTeam
         });
         //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>