How am I able to add timing to javascript that alters text every second?

I would like this code to count up from 0 to 940 (very fast) and alter the text every time it updates

Here's my code (inside my head tag):

<script type="text/javascript">
      function sleep(milliseconds) {
        const date = Date.now();
        let currentDate = null;
        do {
          currentDate = Date.now();
        } while (currentDate - date < milliseconds);
      }
      function onLoad(){
        var x = document.getElementById("numberID");
        var n = 940;
        var text = "";
        for(i = 0;i < n + 1;i++){
          text = i;
          x.innerHTML = text;
          sleep(1);
        }
      }
    </script>

At the moment, it just waits a second then displays '940' on screen and doesn't display it counting up.

Any help would be appreciated, thanks!