The values of any properties of the implementation that are being set to tailor the instance.
实现的任何属性的值，设置用于调整实例。
These properties will not be set now; the function is simply being copied to the object.
这些属性不在现在被设定；函数只是简单的被拷贝到对象。
We let the object being referenced set everything up, because it has access to its own properties.
我们让被引用的对象都设置了，因为它已经进入自己的属性。
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