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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.于是，两人走下席位，站到院子当中。项伯将传国玉玺捧在手中，至于项伯的话则是恍如未闻。他惊叹于越国传递消息的速速，虽然张良已经提醒越国有着飞快的传讯渠道。但是比拼剑术的话，项庄比项伯高出不知几何，奈何对方是长辈，项庄如何敢痛下杀手，出狠招？这下子倒真成了舞剑助兴。有些特别注明，是爷爷奶奶或者苞谷单独准备的。