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Injections, straight run, fart1. There are two options to manage the creation and destruction of state objects. The first is to create and then destroy state objects only when they are needed, and the other is to create all state objects from the beginning and never destroy them. If the state object is relatively large, the first method can be used to save memory, which can avoid creating some objects that will not be used and recycle them in time. However, if the state changes frequently, it is best to create all these state objects in the first place, and there is no need to destroy them, because they may be used again soon.In real life, there are many requests that cannot be made by one person. For example, the salary at the interview may be decided by the technical manager if it is less than 10,000, but the salary between 10,000 and 15,000 may not be approved by the technical manager and may need to be approved by the technical director.如今孩子怕是都会跑了，也不知是男是女。-White ring lamp, 3 nautical miles.Mediator pattern defines a mediation object to encapsulate the interaction between a series of objects. Intermediaries do not need to explicitly refer to each other between objects, thus reducing coupling and independently changing their interaction behavior. The specific structure diagram is as follows:Notice the last line here. The function executed here assigns a function that only returns to the event method. In the process of calling the event handler once, the method of the event object is called every time.