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                            # 作用域

## 作用域鏈

當查找變量的時候，會先從當前上下文的變量對象中查找，如果沒有找到，就會從父級(詞法層面上的父級)執行上下文的變量對象中查找，一直找到全局上下文的變量對象，也就是全局對象。這樣由多個執行上下文的變量對象構成的鏈表就叫做作用域鏈。

## 變量提升
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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