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Backbone.js collection.slice()用法及代码示例

Backbone.js 集合切片方法用于从集合模型中返回元素的浅拷贝。

用法:

collection.slice(begin, end)

参数说明:

begin:它指定元素的开始。

end:它指定元素的结尾。

让我们举个例子。

看这个例子:

<!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:

将上述代码保存在 slice.html 文件中,然后在新浏览器中打开该文件。

BackboneJS slice Collection



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