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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 ~ ~《硬骨头》全方位再现抗战即将胜利时，东三省敌后斗争十分残酷，林海雪原间一批抗战十四年的硬骨头组成了让鬼子闻风丧胆的钢刺队，在党的领导下，钢刺顽强地与关东军周旋斗争，以命相搏，用鲜血与生命去完成一个几乎不可完成的终极任务For the new retail, Osaka Weaving House "all in" has also maintained its consistent caution. This brand, which is good at offline, said when looking online, "We cannot forget offline thinking and ways."本剧讲述了一个弄堂里的普通家庭中，一个爱钱的妈妈和四个性格各不相同的儿子之间的故事。既有家庭的温暖，家庭成员之间的矛盾和情感，也有感人的爱情故事。……母爱的伟大本是可歌可泣，为何由此变成犯罪的动力？还有家庭惨案、警察相残、医疗事故弄出人命，结案十多年的案件突然翻案……该剧根据鲜橙的小说《掌中之物》改编。讲述了女主柯滢为保护自己和家人，与不法势力斗智斗勇，并联合为警方办案提供线索的外卖小哥小武，暗中搜集封氏集团犯罪证据，历经重重困难，协助警方终以正义战胜邪恶的故事。