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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.Whether the normally closed fire door is in normal working state and locked; Whether the fire shutter is in normal working state and whether articles are piled up under the fire shutter affect its use.FOX迄今为止最成功的电视连续剧。该剧最初是The Tracey Ullman Show的副产品，作为它的一分钟补白。 The Tracy Ullman Show的执行制片人，James L. Brooks 和 Sam Simon觉得这些人物可以做成一个半小时的电视剧，于是他们立刻动手，开始了这部在电视台黄金时间段，历时最久的卡通系列剧。辽沈战役前夕，隐藏在北平警察局里的地下党员郑朝阳因叛徒出卖不得已紧急撤退。同时带走了国民党精心准备的地下潜伏名单。这是一部带有传奇色彩的西部片。三毛偷了县令上贡给知府的夜明珠，被教头十步追杀。大头和二蛋出手相助，却无端惹来大祸。寡妇水儿救了他们，因拒绝说出其藏身之处，为十步所害。于是，三个男人集体踏上复仇之路。Do you have any idea?　　陈汉昌和徐掌柜的女儿玉珠无意中相识。陈汉昌喜欢上了天性聪慧、多才多艺的玉珠。二人前去鸡场看斗鸡，被王子敬的手下邢副官跟踪，邢副官安排人绑架了玉珠。陈汉昌救下了玉珠，二人深深地相爱了。