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Step 3: iPhone Enters DFU Mode Key Operation Comes!(PS: The author's equipment, heart-to-heart drinking, sweeping and soul-settling are +1)名模麦子在年轻时救了一女孩，不慎伤了膝盖，结束了职业生涯，转入幕后，用自己的经验培养了大批超级名模，她的严苛在业内赫赫有名，人送外号T台魔王，星光熠熠的T台，一场青春与梦想的模特秀砰然上演……　　角色选定Characteristics: UnknownThe problem is. . . There is no steam version of the game. . . How to divert. . .Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.