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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 ~ ~However, this book breaks the keynote of "talent determinism" and debunks the myths of Paganini, Mozart and high jumpers. Their success is achieved through long-term training, and no one can succeed casually. They only show a stronger interest in certain things when they are young, and then they are induced by their parents or teachers.Https://pan.baidu.com/s/1pLqQb27(End) DDoS Three Major Attacks: Arbor Details of Current DDoS Three Major Attacks2018-03-02 10:28:21歉意地对少年笑道：哥哥不要急，等一下就好了。Action: Cry bitterly.