How to using setTimeout in side loop javascript for wait a second and then process next loop?

How to using setTimeout in side loop javascript for wait a second and then process next loop ?

i tried to using setTimeout in side for loop javascript for wait a second and then process next loop, but it’s not work.

<script>
for (let i = 1; i < 3; i++) {
  setTimeout(function(){
      alert(i);
    }, 2000);
}
</script>

When run code i want to get result like this

wait 2 second then alert “1” wait 2 second then alert “2“