SOURCE

function digitUppercase(n) {
  const fraction = ['角', '分'];
  const digit = ['零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖'];
  const unit = [
    ['元', '万', '亿'],
    ['', '拾', '佰', '仟']
  ];
  let num = Math.abs(n);
  let s = '';
  fraction.forEach((item, index) => {
    s += (digit[Math.floor(num * 10 * 10 ** index) % 10] + item).replace(
      /零./,
      ''
    );
  });
  s = s || '整';
  num = Math.floor(num);
  for (let i = 0; i < unit[0].length && num > 0; i += 1) {
    let p = '';
    for (let j = 0; j < unit[1].length && num > 0; j += 1) {
      p = digit[num % 10] + unit[1][j] + p;
      num = Math.floor(num / 10);
    }
    s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
  }
  
  return s
    .replace(/(零.)*零元/, '元')
    .replace(/(零.)+/g, '零')
    .replace(/^整$/, '零元整');
}

console.log(digitUppercase(1432.43))