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Since the single mode is instantiated only once, the first call returns an instance object of a. When we continue to call, the instance of b is the instance of a, so aa is printed below.《上阵父子兵》是著名导演花箐继《我的兄弟叫顺溜》、《远去的飞鹰》之后的又一部战争力作，也是他“抗战三部曲”的收官之作。该剧仍从小人物出发，描写了一位老实巴交的农民乔日成为了一路追随“不孝”之子乔群，最终成为抗日英雄的传奇故事。Code as above; Write three functions of order500, order200 and orderNormal respectively, and process their own business logic in the functions respectively. If their own functions cannot be processed, they will return the string nextSuccessor to pass it back, then encapsulate the constructor Chain, pass an object fn into it, and have their own attribute Successor. There are two methods setNextSuccessor and passRequest on the prototype. The method setNextSuccessor specifies the order of nodes in the responsibility chain, and saves the corresponding method to the attribute this.Successor, chainOrder500. SetNextSuccessor (chainOrder200); ChainOrder200. SetNextSuccessor (chainOrderNormal); Specifies the order in the chain, so this.Successor references the order200 method and the orderNormal method, so if chainOrder500.passRequest (1, true, 500) is called for the first time, the order500 method is called, output directly, and chainOrder500.passRequ is called for the second time.Generally speaking, Nagoya's subway route is developed and not particularly complicated. Although it is not very cheap, it is not expensive and has no edge. It is very convenient to go anywhere with more than one kilometer and one stop.It mainly refers to the news in the traditional fields of politics, economy, culture and military, and also includes the mobile Internet and O2O, which are subdivided into vertical fields and carry different products. This market is not large enough and the ceiling is relatively low, so many information and news platforms either do not do much or have to continuously expand their borders.必娶女人讲述的是，一个在你我生命中一定会遇到的「绊脚石」，那种专施小奸小恶来换取成功的--「必取」的故事。 女主角蔡环真，不仅为爱而与好姐妹胜男反目成仇，又设计陷害男主角郝萌，让他以为自己与环真发生超友谊关系，需要对环真负责， 正所谓女人不坏，男人不爱，可恨之人也有他的可取之处，这样让人恨得牙痒痒的「必取」， 最後会是如何扭转形象，蜕变成「必娶女人」，找到自己的必嫁男人呢？