BackboneJS collection.slice()方法

返回集合模型元素的淺拷貝。

語法

collection.slice(begin, end)

參數:

begin: 指定從哪裡開始提取元素。
end: 指定在結束元素位置提取。

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">
         var City = Backbone.Model.extend();

         //The variable "Cities" contains the elements which are to be displayed when 'slice()' method is called
         var Cities =['NewYork', 'Sydney', 'Durban', 'Lancashire', 'Kent'];

         //The collection instance "cities" uses the "Cities" variable to represent the model elements in the collection
         var cities = new Backbone.Collection(Cities,{
            model:City
         });

         //The slice(1,4) method begins the element extraction at index "1" and ends the extraction of elements up to the index "4"
         var mycity = Cities.slice(1,4);

         //The 'length' property specifies the total number of sliced elements between 1 and 4
         document.write("Number of Cities:", +mycity.length);
         document.write("<br>");
         document.write(JSON.stringify(mycity));
      </script>
   </body>
</html>

輸出

讓我們進行以下步驟來看看上麵的代碼工作：

保存上述代碼在文件slice.html
在瀏覽器打開這個HTML文件。