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When switching the background, make some changes to the color of the characters. In this program, we used the building blocks of most event modules. Of course, you can also add some background music according to your own needs.90.06.07（星期四）他也算有自知之明，关中这么有章邯镇守着，想要顺利走出来是不可能的。你又不上朝，又不用点卯。We can understand that the responsibility chain mode is a chain composed of processing requests. Requests are passed between these objects in turn until we encounter an object that can process it. We call these objects nodes in the chain. For example, object a sends a request to object b. If object b does not process, it will give the request to c. If object c does not process, it will give the request to d, and so on, until one object can process the request. Of course, if no object processes the request, then the request will leave the chain.Let's first look at how to order a pizza: