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                            # 介紹
* 一個對象有狀態變化
* 每次狀態變化都會觸發一個邏輯
* 不能總用 if...else 來控制

# 有限狀態機
* 有限個狀態，以及在這些狀態之間的轉換
* 如交通信號燈
* 使用開源lib：javascript-state-machine
* github.com/jakesgordon/javascript-state-machine

# 設計原則驗證
* 將狀態對象和主體對象分離，狀態的變化邏輯單獨處理
* 符合開放封閉原則
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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