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You can ask me questions. I'll help you ask questions and give you a reply.The soldier who flushed him later blamed himself. I also advised the young man that there was no way out. No one wanted to do this, but there was really no way out. "Begin to close the computer!Subtract the number on our left from the number on the right of the enemy. If the result is less than zero, the enemy will die.杨必归突然望向西南方向，娘说爷爷奶奶不愿随爹出海，是真的么？是了。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 ~ ~