TypeScript for in 對數組和對象操做時

for..in 方法 對數組操做時數組 let list = [4, 5, 6]; for (let i in list) { console.log(i); // "0", "1", "2", } for (let i of list) { console.log(i); // "4", "5", "6" } for in  對數組對象操做時 打印屬性code let list

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