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In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.哦？杨长帆低头俯视笑道，好久不见了。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.徐风回头看了他一眼，眼神里透着点委屈：知道了。影片讲述的是憨厚朴实的山里娃铁头（来喜饰演），由于没钱娶心上人进城去找表哥杨伟（于非饰演）讨债的过程中结识了在城里开赌场的海哥（刘桦饰演），并发生了一系列令人捧腹的故事……For example, Tmall 618 opened the coupon collection and preheating online. When Osaka Weaving House transplanted it to offline stores, it cut the activity into six promotion bands with different themes, specifying the promotion time and purpose, and avoiding the rush of shopping guides. In each band, for different types of users, sales skills are set separately to improve the success rate of shopping guide.科举探花，却以一把凡铁飞刀，冠绝天下的李寻欢。