Comma separate number js

comma_separate_number.js

commaSeparateNumber(event) {
  let x, x1, x2;
  let nStr = event.target.value + '';
  nStr = nStr.replace(/\D+/g, '');
  x = nStr.split( '.' );
  x1 = x[0];
  x2 = x.length > 1 ? '.' + x[1] : '';
  var rgx = /(\d+)(\d{3})/;
  while ( rgx.test(x1) ) {
      x1 = x1.replace( rgx, '$1' + ',' + '$2' );
  }
  event.target.value = x1 + x2;
}

Html

<input type="text" inputmode="number"  onkeyup="commaSeparateNumber(event)" />

Js

function commaSeparateNumber(event) {
  let nStr = event.target.value + '';
  nStr = nStr.replace(/\D+/g, '');
  nStr = parseInt(nStr).toLocaleString('en-US');
  event.target.value = nStr;
}