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ES6中class类使用方法及教程（基础篇）

每一个class类中，都有一个constructor构造器，如果没有手动指定constructor构造器，那么可以认为class类内部，有个隐形的，空的constructo...
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ES6中class类使用方法及教程（进阶篇）

一、使用extends实现子类继承父类为什么要实现子类继承父类？下面的代码两个类American和Chinese中的constructor里面的代码是一样的，如果我们要建立...
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