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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.　　Charlie患了癌症，虽然化疗会有很高的治愈率，但是他却选择了更加"自然"的疗法，他的两个多年死党无法说服他改变主意，便铤而走险绑架了他，强行为他化疗。还有牛羊和马匹，我听说贵国出产的马虽然矮小，但耐力很强，能负重。下更预计晚八点。MoveSome common actions are listed here, and later articles will give detailed examples and summaries of them:这份男人的骄傲和占有欲还是得到了很大的满足。