srcmini本文概述
extend方法用于扩展主干的collection类以创建你自己的collection。它提供了实例属性和可选的classProperties，它们可以直接附加到集合的构造函数上。
句法：
Backbone.Collection.extend(properties, classProperties)参数说明
properties：属性为collection类提供实例属性。
classProperties：类属性附加到集合的构造函数上。
让我们举个例子。
请参阅以下示例：
<!DOCTYPE html>
<head>
<title>Extend 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 model 'MyTeam' includes default values and extended using the Backbone.Model class
var MyTeam = Backbone.Model.extend({
defaults: {
player: "Dhyanchand", country: "India"
}, });
//'MyTeam1' is an instance of the collection
var MyTeam1 = Backbone.Collection.extend({
model: MyTeam //model 'MyTeam' is specified for a collection by overriding the 'model' property
});
//The collection 'MyTeam1' is instantiated by using new keyword
var myval=new MyTeam1({});
//The JSON.stringify() method returns values of collection in the JSON format
document.write("The values in the collection are: ", JSON.stringify(myval));
</script>
</body>
</html>输出：
将以上代码保存在extend.html文件中，然后在新的浏览器中打开此文件。
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