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15In addition, is there any more stable positioning method for the safety door card Tank?神秘瑰丽的妖灵世界，奇奥无穷的时空妖灵之书，聂离追寻着世界的真相。美丽温柔的叶紫芸、倔强高傲的肖凝儿，面对两位女神的青睐，他该如何抉择？还有患难与共的兄弟，一起修炼最强功法、最强妖灵之力，踏足武道巅峰。/peer (peeping)9　　备将他们秘密接回秦国，恢复他们已经渐被人们遗忘了的秦国太子妃与长公子的身份。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.