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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 ~ ~小篆是秦国的官方文字，黑色的字迹是由蒙恬发明的毛笔所书写，左下角的一片朱红，依稀可以看清楚写的是受命于天，既寿永昌，不言而喻，这帛书赫然是一封——秦朝的诏书。女優の新川優愛ドラマ初主演する4月7日土曜日午後11時40分フジテレビ系ドラマ｢いつまでも白い羽根｣で藤岡陽子の同名小説。共演は加藤雅也、伊藤沙莉で3月から撮影開始する。　　张一男是李春天姐姐李思扬的前男友，多年前李思扬去了美国，两人不得已分手。在李春天的介绍下，张一男和刘青青认识并相恋，是一对欢喜冤家。Golden Ball, Sonik, Vest　　程大元在病房里给病友号脉，吓得病友以为自己大限将至，被护士长彭瑞云训斥了一通。脾气暴躁的前妻安素贞想与大元复婚，派儿子大龙从中撮合被大元识破。安素贞不死心，三番两次来医院找程大元复合，护士长彭瑞云帮忙拦住了她，大元心里有点感激。她闭上眼睛，努力镇定心绪。