let arr = [
"a"
,
"b"
];
for
(a
in
arr) {
console.log(a);
//1,2
}
for
a of arr) {
console.log(a);
//a,b
简单说,for in是遍历键名,for of是遍历键值
可以说javaScript 的遍历有三种了each ,for in , for of,看用的地方
let arr = [
"a"
,
"b"
];
for
(a
in
arr) {
console.log(a);
//1,2
}
for
a of arr) {
console.log(a);
//a,b
简单说,for in是遍历键名,for of是遍历键值
可以说javaScript 的遍历有三种了each ,for in , for of,看用的地方