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                ``` 觀察者模式(Observer),當一個對象的狀態發生改變時,依賴他的對象會全部收到通知,并自動更新。 ``` ``` 場景:一個事件發生后,要執行一連串更新操作.傳統的編程方式,就是在事件的代碼之后直接加入處理邏輯,當更新得邏輯增 多之后,代碼會變得難以維護.這種方式是耦合的,侵入式的,增加新的邏輯需要改變事件主題的代碼觀察者模式實現了低耦 合,非侵入式的通知與更新機制 ```
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