javascript 复制原型进行继承？
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Copy prototype for inheritance?
提问by SpaceFace
I was playing around with JavaScript in particular simulating object oriented programming with classes and whatnot.
我在玩 JavaScript，特别是用类和诸如此类的东西来模拟面向对象的编程。
I knew about this way of achieving inheritance
我知道这种实现继承的方式
MyClass.prototype = new AnotherClass();
But I wasn't satisfied, I didn't like how I needed to call the constructor of AnotherClass. So I was playing around and I came up with something that seemed to work and basically want a second opinion.
但我并不满意，我不喜欢我需要调用AnotherClass. 所以我在玩，我想出了一些似乎有效的东西，基本上想要第二个意见。
function clone (obj)
{
function CloneFactory () {}
CloneFactory.prototype = obj;
return new CloneFactory();
}
MyClass.prototype = clone(AnotherClass.prototype);
By cloning the prototype we get a new copy of it and assign that to MyClass's prototype so that changing the inherited properties will not affect the parent's prototype's properties. Like this would MyClass.prototype = AnotherClass.prototype.
通过克隆原型，我们获得了它的一个新副本，并将其分配给MyClass的原型，以便更改继承的属性不会影响父原型的属性。像这样会MyClass.prototype = AnotherClass.prototype。
I ran stress tests and this is more efficient under certain circumstances, i.e. when there's a lot of code in the parent's constructor, otherwise it's about the same. Another benefit (or at least I find it to be beneficial) is that it allows to some extent information hiding from the subclasses. Any privileged methods and members will NOT be inherited.
我进行了压力测试，这在某些情况下效率更高，即当父的构造函数中有很多代码时，否则大致相同。另一个好处（或者至少我觉得它是有益的）是它允许在某种程度上隐藏子类的信息。任何特权方法和成员都不会被继承。
Is there some major pitfall that I'm overlooking?
我忽略了一些主要的陷阱吗？
I'm not an expert with JavaScript, actually I'm fairly new to JavaScript, so I'd like to have a second opinion on this because I can't seem to find anything through Google. I don't want to implement bad code :)!
我不是 JavaScript 专家，实际上我对 JavaScript 还很陌生，所以我想对此提出第二意见，因为我似乎无法通过 Google 找到任何内容。我不想实现糟糕的代码:)！
回答by Kevin Ennis
This is almostexactly what Object.createdoes. The function you've written is a pretty standard "polyfill" for that method.
这几乎就是Object.create这样做的。您编写的函数是该方法的一个非常标准的“polyfill”。
This is a really common way of abstracting object creation in a way that more closely reflects "true" prototypal inheritance. Definitely a safe way to do things.
这是一种非常常见的抽象对象创建方式，它更接近地反映了“真正的”原型继承。绝对是一种安全的做事方式。
Oh, and here's a link to the MDN entry for Object.create, if you're interested: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/create/
哦，Object.create如果您有兴趣，这里是 MDN 条目的链接：https: //developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/create/
You'll notice at the bottom that they actually include the polyfill, which is pretty much identical to your code, save for some safety checks and variable names.
您会在底部注意到它们实际上包含了 polyfill，它与您的代码几乎相同，除了一些安全检查和变量名称。
