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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 ~ ~As a new salesman, don't rush out to find customers. First of all, it is also the most basic thing to have a comprehensive understanding of the attributes of the products to be promoted, and to have an understanding of any aspect and information about the products. At the same time, we should have a familiar process with the company's work flow and understand the company's sales and operation system. Only by mastering these can we well introduce the company's products to our customers, and only when we encounter relevant problems in the marketing process can we know how to solve them, so as not to be in a hurry and affect our customers' confidence in the company. Therefore, sharpening knives does not miss woodcutters, and when they are fully prepared to find customers, the results will definitely be different.《桐柏英雄》是一部中国解放战争题材的电视剧，改编自同名小说《桐柏英雄》。由桑华、祝东宁、白杨导演，何晟铭、张逗逗、金晨等主演。千金小姐孙俐俐（官恩娜 饰）与辛万军一见面便斗嘴，然而岁月见长情愫渐生；那边Vincent复牌后深感得来机会不易，为人处事均小心翼翼不想再次跌下，与相处三年的女友彩玉（李诗韵 饰演）渐生罅隙，彩玉提出分手……中国首部揭露医疗黑幕纪实。本剧以客观的视角，纪实的手法，全面系统展示了当今医患矛盾的现状。在20多个案例中，医院如何不负责任坑害患者，患者为自己利益如何讹诈医院，医药代表与大夫的钱色交易，医疗改革的艰难，人道主义与经济利益之间的尴尬，医疗事故处理和手术风险的法律问题等等，是我国第一部深刻的直面医疗现状的电视剧…………Add--retroarch at the end, notice--with a space before it范勤在《情丝万缕》中，她的命运很坎坷的。第一个男朋友是被好朋友夺去了，第二个男朋友就快和老婆离婚准备和她在一起时，又因为老婆的了癌症，又和她无缘了。后来才碰上了她的真命天子--“耿直”。范勤和耿直终於结为夫妻，高路、苏婉、堂姐、堂组夫、理发匠刘老和洪华等人都去参加他们的婚礼，场面非常热闹，耿直对於能娶到范勤，心里非常的开心，众人陪着新郎新娘去过三桥，但耿直希望把苏州水乡的桥都过完，这样他就可以和范勤生生世世做夫妻了，大家都很支持他。