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JS中的for循環體比較特殊，每次執行都是一個全新的獨立的塊作用域，用let聲明的變量傳入到 for循環體的作用域后，不會發生改變，不受外界的影響
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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