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backbone.js集合slice

本文概述

Backbone.js集合切片方法用于从集合模型返回元素的浅表副本。

句法:

collection.slice(begin, end)

参数说明

begin:指定元素的开始。

end:指定元素的结尾。

让我们举个例子。

请参阅以下示例:

<!DOCTYPE html>
   <head>
      <title>Slice 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 =['Mau', 'Allahabad', 'Ghaziabad', 'New Delhi', 'Noida'];

         //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>

输出:

将以上代码保存在slice.html文件中,并在新的浏览器中打开此文件。

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