如何在文本输入字段中添加逗号以分隔每组三位数？

function addCommas(nStr) {
  nStr += '';
  var x = nStr.split('.');
  var x1 = x[0];
  var x2 = x.length > 1 ? '.' + x[1] : '';
  var rgx = /(\d+)(\d{3})/;
  while (rgx.test(x1)) {
    x1 = x1.replace(rgx, '$1' + ',' + '$2');
  }
  return x1 + x2;
}

// 使用示例
var inputField = document.getElementById('inputField');
inputField.addEventListener('input', function() {
  inputField.value = addCommas(inputField.value);
});