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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.——————有需要龙套的书友吗？可以在书评区留言。年纪轻轻不到十三就是秀才了。不如这样，我们汉国境内的所有粮仓都让他管理，相信她都能够管好啊。[Look at the Dialogue, Attending Doctor Wang Fengya, Girl with Eye Cancer: Family Never Gives Up Treatment]臣见此书，已下令前去逮捕。