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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 ~ ~From September 1, 1939 to September 2, 1945, Germany, Italy, Japan's fascist axis countries (and Finland, Hungary, Romania and other countries) were on the one hand, and the anti-fascist alliance and the world's anti-fascist forces were on the other. From Europe to Asia, from the Atlantic to the Pacific, 61 countries and regions and more than 2 billion people have been involved in the war, covering an area of 22 million square kilometers. According to incomplete statistics, more than 90 million soldiers and civilians were killed or injured in the war.Second, Uncaught TypeError: Reduction of empty array with no initial value性格独特又富有魅力的星探帕奎塔·萨拉斯正在经历人生低谷：她怀念那个传真为王的时代，现在却要努力适应运营在Instagram和Whatsapp之上的娱乐行业。在第二季中，帕奎塔将经历许多生活变化，这些也让她自己和其他人看到她的坚强和充满韧劲。在经历一段特别的人生之旅后，帕奎塔才懂得，只有悦纳自己，方能获得成功。《胖妞星探》是一部犀利的伪纪录片，这部令人百感交集的剧集将让您笑到流泪。由香港无线电视制作的现代时装医务纪实电视剧《妙手仁心3》是《妙手仁心》系列的第三辑，监制戚其义与编剧周旭明的黄金组合更是精心打造此辑“妙手系列”。此辑剧集在风格上延续了前两辑经典之处，一如既往的得到医务人员协助实景拍摄，继续讲述医护人员在工作中的点滴故事。Saengfarng公主的母亲本是泰国的平民，为了皇后的头衔和王冠上那宝贵的珠宝“Silamanee”而嫁给了ChaingLat国国王，婚后，Saengfarng公主的母亲变的焦虑不安，很快这段婚姻以失败告终.有亲催情节了。