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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 ~ ~/surrender在这样大的祸事面前，个人的力量总是渺小的，她虽然活了两辈子，还没经过战争呢。我说小妹，你咋来了？这腊月荒天的，你家里就没事，就不忙？泥鳅姑姑张大嘴巴看着张老太太，半天合不拢。那会儿他跟菊花还没成亲哩，就想着收拾房前屋后了，好等菊花进门有果子吃。嘉兴王江泾，血流成河。