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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.《邻居冤家》讲述一对冤家的前夫搬到隔壁成为邻居，在这一对离婚夫妻之间开始一场新的战争的故事。如果说夫妻的战争使其成为冤家，那么邻居之间的战争将成为最终能治愈对方的伤口，使其成为人生可靠的支援军的，使双方都能成为胜利者的战争。Load the module by looking up the node_modules directory2. Classification of flame retardants