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过着平凡上班族生活的青梅竹马橘日向和神宫寺司。　　她泪眼凝噎，『你早该明白，我已失去爱你的勇气。』探头看看还在，这才放心。为救人，不求回报，不惜名声受损，不惜自身性命。Before performing an event callback, the current component traverses all of its parent components up. Save to this array. Because the DOM structure may be changed in event callbacks, the component hierarchy should be traversed first to prevent conflicts with cached ones. After that, the calls are dropped in turn.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.