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View flight simulator helpAlthough 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 ~ ~Four fairies那田夫子虽然没有出仕，你咋就知道，这不是他自己喜欢的日子呢？他要是真想当官，也不会这样行事了，以他的文采，怎会连举人也考不上？葫芦点头，接过书细细默诵。一心挚爱一个女人是简单的幸福。如果同时爱上两个女人，将会是复杂的痛苦。要是两个女人竟然是一对姊妹花，那就更难解难分了。不过，美丽的答案是＿谁[守着阳光守着你]？那么她（或他）便是“守着幸福守着爱”。