Backbone.js 集合重置用于用新的模型列表替换集合。它批量更新集合。它可以使用新的模型列表重置集合或清空整个集合。
它与添加和删除集合不同,因为它们一次更改一个是好的。另一方面,重置集合会批量更改。
用法:
collection.reset(models,options)
参数说明:
models:它指定需要在集合中重置的集合实例的名称。
options:它包含空值以清空集合。
让我们举个例子。
看这个例子:
<!DOCTYPE html>
<head>
<title>Reset 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">
//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:
将上述代码保存在 reset.html 文件中,然后在新浏览器中打开此文件。
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注:本文由纯净天空筛选整理自 Backbone.js collection.reset()。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。