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                            #### 1. 暫時性死區
    1. 在塊級作用域內，使用let const聲明的變量，在未聲明之前使用都會報錯，形成暫時性死區
    2. 變量的提升解決的問題是函數之間的調用
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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