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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 ~ ~　　范裔风和乔可欣从小像亲兄妹一样长大，青梅竹马，情愫暗生。范裔风的父亲和乔可欣的母亲相继去世。同样失去了至亲的两个人更加珍惜对方，相约定永不分离。掌柜的听了大喜，千恩万谢，谢了又谢。6300 X 10% +300=930Po super-wearable sports socks, Stance, NBA officials designate sock suppliers, Make all kinds of nice socks, Socks, stockings, etc. I like socks, I can't get out when I enter the store, Then I found this running sock, It is divided into left and right feet. It is woven in three dimensions and is still formed without wearing it. It shows that it is written on which part plays what role. It is not clear. It is very comfortable anyway. I bought two kinds of boat socks and short barrel socks, both of which are super easy to wear. The heel of the boat socks is still one piece higher. I am not afraid of shoes grinding heels. I am sometimes a bloody foot that even sneakers will grind. Push Stance!富人的世界并不像看起来那么完美。它可能在短时间内变成真正的黑暗。当他们中的一个人开始一场人生游戏，导致一场谋杀并揭露那些黑暗秘密时，会发生什么？富人的世界并不像看起来那么完美。它可能在短时间内变成真正的黑暗。当他们中的一个人开始一场人生游戏，导致一场谋杀并揭露那些黑暗秘密时，会发生什么？