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The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.阿甘出生于美国二战后阿拉巴马州一个小镇，他先天弱智，但他妈妈却常鼓励他“傻人有傻福”，要自强不息。阿甘像普通孩子一样上学并且认识了一生的朋友和至爱珍妮，在珍妮和妈妈的爱护下，阿甘开始了一生不停的奔跑。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 ~ ~1. An event bubbling corresponds to triggering the same event on the upper layer.　　同时，在监狱里的前毒品集团头目卢塞洛获悉了“暗黑破坏神”趁虚而入的事实也异常愤怒，答应与政府合作提供情报，于是西恩利用他对贩毒网络的熟悉，和缉毒Action: Wave with your hand to refuse.Shishi Yongning Town, located on the west side of the Taiwan Strait, includes Minnan Gold Coast Tourist Resort, City God Temple, Zhenhai Stone, Ancient Acropolis Site, etc. Minnan Gold Coast Tourist Resort is wholly owned by Hong Kong Youbang International Group. The planned area is 6,000 mu, with the first phase of development of 1980 mu and an investment of nearly 300 million yuan. At present, the resort's main projects and facilities include: Jinsha Amusement Park, Undersea World, Dolphin Performance Hall, Haitian Buddhist Country, Tadao Guanyin, Yacht Club, Racecourse, Bathing Beach, Open-air Nightclub, Shopping Street, Gold Coast Hotel, Post and Telecommunications Hotel, Ocean Hotel, Education and Training Center and other large-scale and characteristic amusement projects and service facilities. The Gold Coast has beautiful scenery and spring-like seasons. It has become a coastal tourist resort with rich tourism connotation, integrating travel, travel, food, housing, shopping and entertainment. It is one of the ten key tourist attractions in our province.