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First, unify the interfaces:Brief Introduction: Family stories, funny and humorous, bitter touching, carefree liberation. The eldest of the three brothers in a family has gone through all kinds of hardships to form a bond with the heroine played by Tao Zhiyuan. [1]且说葫芦和秦淼，一路沉默着，到了秦家院门前，秦淼方才开口叫了一声：葫芦哥哥。In fact, delegate variables (parameter lists) and events execute methods in this form.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.2. Browser Cookie Policy