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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 ~ ~　　然而，伴着率真年轻25岁暖男马赛（彭于晏 饰）的出现，对盛如曦的生活开始产生了微妙的影响……刘欣桐，一个成长在贫民之家的的女孩，可是却始终不改阳光坚强的本性。她的生活原本平淡无奇，然而一次意外，她进入了一个截然不同的生活圈子，和母亲迫不得已搬进了富商纪百均的家里。自此，刘欣桐的生活发生了翻天覆地的变化。进入纪家后，刘欣桐结识了刁蛮任性的纪家大小姐纪智珍、帅气温柔的纪家大公子纪振宇（贾景晖饰）以及她命中注定的爱人利耀南。而纪智珍和刘欣桐却同时对利耀南产生了情感，也因此发生了种种矛盾。几个人在爱情、友情、亲情的多重考验下，经历了欺骗、背叛和别离，终于有了救赎和收获。刘欣桐的坚强和善良打动了所有人包括纪智珍和纪振宇，她平凡却珍贵的美丽，散发出夺目的光彩，最终收获爱情的同时，也和失散多年的亲生父母相认。This is the second sub!Next, start exporting dry goods.大启朝灭亡，出现南楚、东宋、西凉，以及北燕四国。作为大启朝的后裔巫教教主为光复大启朝，故意留下一段蝴蝶女婴的预言，预言说南朝出蝴蝶女婴，东宋如果遇到不杀将会灭亡，从此东宋陛下最大的心愿便是除去蝴蝶女婴。东宋太子连杪尘从小便被这预言胁迫，因而更想解开预言的神秘面纱，故特亲自乔装混进南楚最大的酒楼来调查蝴蝶女婴。白蝶和连杪尘相遇，本应是命中克星的两个人却相互爱慕起来，即使经历种种磨难，也改变不了两个人之间的爱。Open the course of "Gem Processing Technology", It is found that it is based on "Gem Processing Technology" written by Professor Liu Ziqiang of Jewelry Department of Jinling Institute of Science and Technology. Including six aspects of knowledge-a preliminary understanding of some gemstone raw materials, Understand the names, characteristics and development history of different gemstone cut styles, understand some basic equipment and accessories for gemstone processing, understand the processing principles and technological methods of gemstones, see the processing process of standard round polyhedral styles, and learn the processing quality evaluation of gemstones (including jadeite).