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如何理解在组合继承中,子类的构造函数会代替原型上的那个父类构造函数这句话?
上面这个例子就是一个组合继承的关系,b继承了A, 并且重写了 a 的 show方法,这个时候a的show方法属于完全代替的关系。
show