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Although there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~In the previous example of electric lights, a state mode program was completed. First, the Light class is defined, which is also called Context here. Then in Light's constructor, to create instance objects for each state class, Context will hold references to these state objects in order to delegate the request to the state objects. The user's request, that is, the action of clicking button, is also implemented in Context, with the following code:有时候实力隐藏起来行动会更方便，而且往往有意想不到的效果，所以平武一直就低调，深藏不lù。话罢，他拂袖下山，不望补充道：好好查。随即几艘木筏立即动作起来，将章邯等人渡过河。她又不想扩大医馆，干出一番轰轰烈烈的成就。这一路到清南村，不断碰见熟人，寒暄打招呼，说笑几句，竟是没个停歇的。