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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 ~ ~Account Name: Jiangsu E-Commerce Service Center Co., Ltd., Opening Bank: Hanzhong Road Sub-branch of Nanjing Branch of Huaxia Bank, Account Number: 4140200001819100012220倚天不出，谁与争锋？其实有倚天剑也没有什么了不起。直到这一天，小美遇见了她的新同学小杰（林晖闵饰），她被小杰深深吸引……他们不知道，永平帝是真怕香荽。