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郑长河、秦枫、青山叔侄和秦家几个孩子都坐上桌。The fifth step is to write the implementation of each state class. It is worth noting that StateFactory is used to avoid the problems caused by the absence of abstract classes in javascript.Explain Node.js (3): Explore the module mechanism of Node.js该剧根据同名小说改编。讲述了少女林朝夕（张子枫 饰）由于长期仰望父亲林兆生（雷佳音 饰）和初恋裴之（张新成 饰）两位数学天才，从而悄悄掩埋了内心对于数学的热爱，直到经历了双时空之旅，她迸发出了超越想象的力量。在父亲老林的引领以及裴之的帮助下，林朝夕重拾信心，与伙伴们并肩作战，为了追寻真理与爱而拼尽全力。全剧以“爱”为核心理念，倡导人们相信：心若在，梦犹存，不再独行，为“爱”出发！必要的时候可以支援北岸。Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows: