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Make Joint Efforts to Eliminate Binjiang Cancer该剧讲述了围绕段柏文、于池子、冯三水和斯嘉丽四人而展开一段最晦涩的青春故事。二月，杨柳抽出嫩条，随风婀娜摇摆。（_&书&吧）整个军营里伤兵哀嚎不断，士气低落，无诸自己也是垂头丧气。天机如何？难道我先前所见，并不是未来天机？周青看着只剩下一点灰烬的张宇正，不禁叹道。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.就算能见，也是五十六亿年后的事情。