let obj = {name: '小明', age: 18} for (let key in obj) { console.log(obj[key]) } let arr = [{'name': '小明', 'age': 18}, {'name': '小明', 'age': 18}] for (let key of arr) { console.log(key) }
for in 用于对象
for of用于数组
let obj = {name: '小明', age: 18} for (let key in obj) { console.log(obj[key]) } let arr = [{'name': '小明', 'age': 18}, {'name': '小明', 'age': 18}] for (let key of arr) { console.log(key) }
for in 用于对象
for of用于数组