本文概述
- 参数说明
它与添加和删除集合不同,因为它们一次可以更改一个集合是很好的。另一方面,“重置”集合会批量更改。
句法:
collection.reset(models, options)
参数说明模型:它指定集合实例的名称,需要在集合中重置它们。
选项:它包含空值以清空集合。
让我们举个例子。
请参阅以下示例:
<
!DOCTYPE html>
<
head>
<
title>Reset Collection Example<
/title>
<
script src="http://img.readke.com/220416/043RS529-0.jpg" type="text/javascript"><
/script>
<
script src="http://img.readke.com/220416/043RT504-1.jpg" type="text/javascript"><
/script>
<
script src="http://img.readke.com/220416/043RS548-2.jpg" 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: "India"
}
});
//'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: "Russia"});
//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:
将上面的代码保存在reset.html文件中,然后在新的浏览器中打开此文件。
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