Javascript 这里的“_”是什么意思？
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What does "_" means here?
提问by Mellon
I am learning backbone.js, in it's tutorial, it has the following code
我正在学习backbone.js，在它的教程中，它有以下代码
var object = {};
_.extend(object, Backbone.Events);
...
I don't understand the "_" in the code, what does it means? and what is this "extend"? does it has the same meaning as jQuery.extend ?
我不明白代码中的“ _”是什么意思？这个“扩展”是什么？它与 jQuery.extend 具有相同的含义吗？
采纳答案by benvds
It copies all the Backbone.Events properties over to the object. Extend is a method from the underscore library: http://documentcloud.github.com/underscore/#extend
它将所有 Backbone.Events 属性复制到对象。Extend 是下划线库中的一个方法：http: //documentcloud.github.com/underscore/#extend
I'd say it's the same as the jQuery method.
我会说它与jQuery方法相同。
回答by Bruno Rohée
From Backbone's own homepage :
从 Backbone 自己的主页：
Backbone's only hard dependency is Underscore.js.
Backbone 唯一的硬依赖项是 Underscore.js。
_is the object created by Underscore.js, in the same way as $is the jQuery object
_是 Underscore.js 创建的对象，$和 jQuery 对象一样
http://documentcloud.github.com/underscore/#extendas for what _.extenddoes.
http://documentcloud.github.com/underscore/#extend至于是什么_.extend。
