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看了typescript手册中接口部分，请问正确的应该怎么写？

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看了typescript手册中接口部分，请问正确的应该怎么写？

Snipaste_2020-06-15_20-51-36.png

请问在Image接口类中如何正确的声明state属性啊？


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文档写的很清楚了,私有属性不可以被其他类实现,只有子类可以,所以Image想要实现接口必须继承Control
image.png


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