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## 明確作用域



任何時候都需要





任何時候都要明確作用域 – 提高可移植性和清晰度. 例如, 不要依賴于作用域鏈中的 `window` 對象.

可能在其他應用中, 你函數中的 `window` 不是指之前的那個窗口對象.










                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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