backbone.js集合slice backbone.js集合slice|Backbone.js教程

本文概述

参数说明

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。
【backbone.js集合slice】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="http://img.readke.com/220416/052G14017-0.jpg" type="text/javascript">< /script> < script src="http://img.readke.com/220416/052G11K0-1.jpg" type="text/javascript">< /script> < script src="http://img.readke.com/220416/052G12423-2.jpg" 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。