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                            **作用域** 是指在代碼運行過程中特定變量，函數，對象的可訪問性。作用域最大的用處是隔離變量。js的作用域包含全局作用域、函數作用域、塊級作用域，塊級作用域是ES6中才提掉的一個概念。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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