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Go 会自动处理值和指针之间的转换 所以你都可以使用指针来调用方法,但是后者作者想强调的是 想要避免在调用方法时产生一个拷贝,或者想让方法可以修改接受结构体的值,所以最后应该是使用你都可以使用指针类型的接收者(定义方法) ,作者原话是 You may want to use a pointer receiver type to avoid copying on method calls or to allow the method to mutate the receiving struct