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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 ~ ~而且还能趁势将越国的势力范围扩大到大江北岸去，推进到淮河一线。圣诞节后，罗恩度过了一个并不愉快但却十分新奇的生日。这时，伏地魔出现了，这次他竟然杀死了海格的宠物阿拉格格，小伙伴们为这只蜘蛛举办了盛大的葬礼。2171"So did there be any melee between you next? Or did the" dogs "break through the defense line at position 142?" I asked.五个年轻的徒步旅行者在红木森林中鬼鬼祟祟的出现的阴影下，发现了一个早在淘金热时期就被遗弃的金矿，并在追求容易获得的财富时陷入疯狂和贪婪。(12.13 update)