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Javascript neither supports abstract classes nor has the concept of interfaces. Therefore, be very careful when using the state mode. If you forget to implement the buttonWasPressed method for a state subclass when writing a state subclass, an exception will be thrown when the state switches. Because Context always delegates requests to the buttonWasPressed method of the state object. Therefore, let the abstract method of the abstract parent class throw an exception directly, which will be found at least during the program run.Manaka looked like this: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.Some of the resources of this site come from the Internet. For the purpose of transmitting more information, the copyright of this site reprints belongs to the original author or the source organization. If the reprinted manuscript involves copyright issues, please contact us.这是一个循环往复的世界，是深渊，亦是地狱。死寂岛，是一座关了120人的荒岛。绝地求生之中，总有人意外离去。“小丑”是用来看押这120人的角色，被这座岛紧紧控制着。所谓的“生存规则”究竟是真相还是谎言？一切谜底亟待解开。