JavaScript Object-oriented programming (8) using intermediate functions

We put forward a good idea, the reusable parts of a class are all defined in prototype, which can be easily inherited by prototype when the class inherits;

But one problem is that subclasses change the properties of all instances when overriding properties in prototype, because both the parent and child instances share the same prototype;

How to solve it? The idea is to use an intermediate function, see the code:

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JavaScript Object-oriented programming (8) using intermediate functions