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南瓜三个不停提问。6 Psychology.If you need to modify, you have to modify many places.胡钧直起身子，警惕地问道：你们……想干什么？林聪赔笑道：是这样的，我们让一个人换上公主的衣裳，扮作她的模样，然后逃跑，另外两个人在后面追。他们见识多一些，比白果看得更明白，知道香荽并不是没有可能进入皇城的。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.