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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 ~ ~Intelligent shopping guides have solved this problem very well. "80% of the customers in Osaka Weaving House are Tmall users, and consumers will think it is normal to receive shopping guide information through hand-washing." Wang Bo said that the intelligent shopping guide can push specific product information such as "striped short-sleeved household clothes" and "cotton pajamas" according to customer characteristics, greatly improving the conversion rate.　　和李二牛苦不堪言，但他们在训练场上互不相让，生活中相互关心，包揽了训练成绩的前三名，他们脱颖而出，成为了特种兵中的特种兵，与飞行员宋凯飞、来自武术世家的徐天龙组成了“红细胞”小组。官方宣布第4季FX预订一部每集半小时的未定名新剧,B·J·诺瓦克(《办公室》)自编自导并担任执行制作人。该剧每集卡司不同,讲述我们现在生活的世界。该剧前两集的拍摄工作已完成,第一集卡司包括卢卡斯·赫奇斯,凯特琳·德弗,小奥谢拉·杰克逊,乔治·华莱士,爱德华·阿斯纳,第二集卡司包括乔·博恩瑟,波伊德·霍布鲁克,艾米·兰德克,博·布里奇斯。嗯，我记下了，是春风出版社。