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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.So far, a simple file upload program has been written. Of course, this is still a counterexample. The disadvantage here is the same as the first code in the light example. The program is full of if and else conditional branches. The state and behavior are coupled in a huge method. It is difficult to modify and extend this state machine. This problem is exacerbated by the complexity of the links between file states　　薛仁雅饰演金清儿，她是一个放弃了恋爱和结婚，连续8年准备考公务员的公考生，是一个充满了爱和义气的人物。Technical Data of Strength Lifting Weightlifting武周时期，生活在洛阳洛河水两端，不同出生的两个少女意外被卷入悬案之中，她们同心协力揭穿反派阴谋的故事。故事中的两个主人公分别是金吾卫队长的女儿赵青青，以及混迹于城市底层的女孩小骗子，原本过着截然不同生活的两个人，在遭遇洛阳城内一连串匪夷所思的离奇案件后，组成了搭档，她们历经重重考验，仍然以无畏之心在乱世中坚守着正义。