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Code as above; Write three functions of order500, order200 and orderNormal respectively, and process their own business logic in the functions respectively. If their own functions cannot be processed, they will return the string nextSuccessor to pass it back, then encapsulate the constructor Chain, pass an object fn into it, and have their own attribute Successor. There are two methods setNextSuccessor and passRequest on the prototype. The method setNextSuccessor specifies the order of nodes in the responsibility chain, and saves the corresponding method to the attribute this.Successor, chainOrder500. SetNextSuccessor (chainOrder200); ChainOrder200. SetNextSuccessor (chainOrderNormal); Specifies the order in the chain, so this.Successor references the order200 method and the orderNormal method, so if chainOrder500.passRequest (1, true, 500) is called for the first time, the order500 method is called, output directly, and chainOrder500.passRequ is called for the second time.But I like the incumbent best罗七走后，项羽问道：虞子期，你觉得此事可信与否？虞子期道：霸王是担心这是刘邦和魏豹联手是设下的圈套？是啊，不排除这种可能。PS: I tried Chrome, IE11, Firefox, and it was all the same.小葱来到郑长河老两口身边，对他们道：外公外婆，咱们回去吧。