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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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