如果没找到，就在直接基类中找，依此类推，沿着类的继承链向上寻找，直至函数找到或者最后一个也被搜寻过为止。

If it is not found, look in the immediate base class and continue up the chain of classes until either the function is found or the last class is searched.

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将成员从基类复制到与派生类相关联的原型，并沿继承链向上继续执行此过程。

Copies members from the base class to the prototype associated with the derived class, and continues this process up the inheritance chain.

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