input 에 숫자 입력시 3자리 콤마 자동

<input type="text" id="price" onkeyup="inputNumberFormat(this)"/>
<script>
function inputNumberFormat(obj) {
  obj.value = comma(uncomma(obj.value));
}
function comma(str) {
  str = String(str);
  return str.replace(/(\d)(?=(?:\d{3})+(?!\d))/g, '$1,');
}
function uncomma(str) {
  str = String(str);
  return str.replace(/[^\d]+/g, '');
}
</script>