BackboneJS collection.reset()方法

重置集合并用新模型填充数组或将清空整个集合。

语法

collection.reset(models,options)

参数:

  • models: 包含的集合实例的名称,这是需要被复位的集合。
  • options: 选项包括空值清空集合。

示例

<!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 'C_Name' is a model name and includes default value
         var C_Name = Backbone.Model.extend({
            defaults: {
 	           country: "sachin"
            }
         });

         //'PlayersCollection' is an instance of collection and model 'C_Name' is specified by using model property
         var PlayersCollection = Backbone.Collection.extend({
            model: C_Name
         });

         //The 'country1' and 'country2' are the instances of the model 'C_name'
         var country1 = new C_Name({country: "australia"});
         var country2 = new C_Name({country: "england"});

         //Add the model instances to the collection using 'mycollection' collection instance
         var mycollection = new PlayersCollection();
         mycollection.add([country1,country2]);

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

         //Here, the reset() method resets the collection otherwise empties the collection
         mycollection.reset();
         document.write('Number of countries after reset: ' + mycollection.length);
      </script>
   </body>
</html>

输出

让我们进行以下步骤来看看上面的代码工作:

  • 保存上述代码在文件reset.html

  • 在浏览器打开这个HTML文件。