for..in与for..of的区别

for…in是遍历数组、对象的key

let arr = [1, 2, 3];
for (let i in arr) {
    console.log(i)
}
let obj = {
    name: 'wuxiaodi',
    age: 18,
};
for (let i in obj) {
    console.log(i)
}

输出结果：

如果想用for…in遍历值那就把JS代码改成这样：

let arr = [1, 2, 3];
for (let i in arr) {
    console.log(arr[i])
}
let obj = {
    name: 'wuxiaodi',
    age: 18,
};
for (let i in obj) {
    console.log(obj[i])
}

输出结果：

for…of是遍历数组的value

let arr = [1, 2, 3];
for (let i of arr) {
    console.log(i)
}

输出结果：