JS数字转中文

function number2Chinese(n) {
  if (!/^(0|[1-9]\d*)(\.\d+)?$/.test(n)) return '数据非法';
  let unit = '京亿万仟佰拾兆万仟佰拾亿仟佰拾万仟佰拾元角分',
    str = '';
  n += '00';
  let p = n.indexOf('.');
  if (p >= 0) n = n.substring(0, p) + n.substr(p + 1, 2);
  unit = unit.substr(unit.length - n.length);
  for (let i = 0; i < n.length; i++)
    str += '零壹贰叁肆伍陆柒捌玖'.charAt(n.charAt(i)) + unit.charAt(i);
  return str
    .replace(/零(仟|佰|拾|角)/g, '零')
    .replace(/(零)+/g, '零')
    .replace(/零(兆|万|亿|元)/g, '$1')
    .replace(/(兆|亿)万/g, '$1')
    .replace(/(京|兆)亿/g, '$1')
    .replace(/(京)兆/g, '$1')
    .replace(/(京|兆|亿|仟|佰|拾)(万?)(.)仟/g, '$1$2零$3仟')
    .replace(/^元零?|零分/g, '')
    .replace(/(元|角)$/g, '$1整');
}