for-in [MDN, spec] — A loop structure that loops through the names of an object's enumerable properties, including inherited ones, whose names are strings ... ... <看更多>

The for...in loop iterates over the enumerable properties of an object. It also goes up to the prototype chain and enumerates over inherited properties. · Avoid ... ... <看更多>

for..of 迭代物件(object). 如果想用 for...of 來遍歷物件的屬性的話，可以通過和 Object.keys() 搭配使用 ... ... <看更多>

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