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你放心吧。赵光头大笑道：船主自有安排，我是统兵军帅，你来杀人越货。唐主事不怕我在这里打扰么？杨参议耐得住寂寞即可。The Internet has achieved almost instantaneous acquisition of this information. If hackers know where to look for the database, they can break through digital security measures to obtain the data, and can decode the data contained in these systems, and can obtain information that takes years of hard work within hours or even minutes. Hostile countries can start using this sensitive information before anyone realizes that there is a problem. Such efficiency is beyond James Bond's reach.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 ~ ~