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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 ~ ~The handbook of the head horse is a hundred years of tempering by countless head horse people. In my eyes, it is the Bible in the field of public speech.让他们对同乡举起屠刀是万万不可的，若是萧何一意孤行，刀落见红之时，兵变是不可避免的。The third match will be played by C and the winner of the first match, so that everyone can play 2 matches and still keep the suspense of the match.However, there are exceptions. For example, in remote sensing瑞克、弩哥等人经历了尼根的残酷统治之后，新势力以西结（Ezekiel）登场，双方必然会形成激烈的矛盾冲突。恶劣环境下求生存是第一法则，瑞克、弩哥等人趁乱东山再起 [2] 。瑞克会率领山顶寨、神之国等组织的联军对救世军发起进攻，毕竟尼根这个大反派杀死了瑞克的好友，而且还极度威胁到瑞克他们的生存，大战不可避免。