JavaScript 规定，派生类（子类）的 constructor 中必须在使用 this 之前调用 super ()。 更关键的是， super (message) 不只是语法要求——它真正执行了父类的 constructor，从而完成 this.message = message 的赋值，并生成了 this.stack （调用栈信息）。

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