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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 ~ ~AI-CPS OSA long, a short, a long, a short sound. 殇爱讲述女主不顾上一辈的仇恨，执意靠近男主的甜蜜而心酸的爱恋故事。人口又这么多，每个地方的习俗都不一样。　　《牛仔裤的夏天》由一群女孩子主演，该片根据2001年安·布拉谢尔最畅销小说改编而来，讲述了四个闺中密友的故事，这四个小姑娘第一次没有在一起过夏天，将她们联系在一起的是一条会魔法的牛仔裤，尽管这四个女孩体形、个头和欣赏力各不相同，但这条神奇的牛仔裤却总能适合她们。在接下来的一个夏天，在分开的日子里，会飞的牛仔裤给身处不同的地方的她们带来了不同的奇遇，让她们都经历了一个难忘的夏天。