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                            for-in 是javaScript中最常見的迭代語句，常常用來枚舉對象的屬性。某些情況下，可能按照隨機順序遍歷數組元素；
而Object構造器有一個實例屬性keys，則可以返回以對象的屬性為元素的數組。數組中屬性名的順序跟使用for-in遍歷返回的順序是一樣的。
**for-in循環會枚舉對象原型鏈上的可枚舉屬性，而Object.keys不會**
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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