html list number

<script>
jQuery(document).ready(function(){
  var $td = $(".list tbody tr td:first-child");
  var $counter = $(".list tbody tr").length;
  for (var i=1; i<= $counter; i++) {
    $(".list tbody tr:nth-child(" + i +") td:first-child").append(i);
  }
});
</script>