for ...in for...of forEach

迴圈 for...of
迭代對象: 陣列、類陣列、字串、Map、Set、NodeList

forEach
陣列、NodeList

迴圈 for ..in
迭代對象: 物件的key
不可迭代於: 陣列元素

#for ...in #for...of #foreach

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