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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.一起意外的车祸，一场突如其来的灾难，刑警龙刚心爱的女友丧生于一起车祸，肇事者却是有名的基因专家黄祖明。紧接着新的疫情暴发了，医生们束手无策，黄祖明却不肯出狱解救，非要和妻子炎梅英离婚，这到底是为什么？他在逃避什么？疫情是怎么暴发的？刑警龙刚又将如何面对这个曾经夺去他最爱的女人而即将出狱的基因专家？发病的病人一年前都曾经服用过同一种抗基因的药物，而病情为何却在一年后才暴发？2. Then add a cache list to the publisher to store callback functions to notify subscribers (for example, the above buyer has collected the seller's store, and the seller has collected a list list of the store).(2) There are more than 10 registered fire engineers, including at least 8 first-class registered fire engineers, excluding registered fire engineers to be transferred to branches to practice and registered fire engineers to established branches.绿叶第五季……Finally, a summary chart is attached:果然，一个猎户模样的护卫告诉他道：是张家小少爷干的。