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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 ~ ~描述同樣有艱苦歷練的三個女人之間的友情和成長的故事……Statement from Criminal Zhang Xuejun但皇叔有高祖皇帝御笔亲书的遗旨，更有皇室九龙佩，足可证明身份了。　　Commence pour elle une longue nuit durant laquelle elle va devoir lutter pour le respect de ses droits et de sa dignité. Mais comment peut-on obtenir justice quand celle-ci se trouve du côté des bourreaux ?According to the proportion method, the monthly minimum wage standard in this area is calculated as follows: monthly minimum wage standard = 210 × 1.87 + a = 393 + a (yuan) (1)