formatAmountCapitalized 将金额数字转换成大写

formatAmountCapitalized.js

export function formatAmountCapitalized(n) {
  let fraction = ['角', '分'];
  let digit = [
    '零', '壹', '贰', '叁', '肆',
    '伍', '陆', '柒', '捌', '玖'
  ];
  let unit = [
    ['元', '万', '亿'],
    ['', '拾', '佰', '仟']
  ];
  let head = n < 0 ? '（负数）' : '';
  n = Math.abs(n);
  let s = '';
  for (let i = 0; i < fraction.length; i++) {
    s += (digit[Math.floor(shiftRight(n,1+i)) % 10] + fraction[i]).replace(/零./, '');
  }
  s = s || '整';
  n = Math.floor(n);
  for (let i = 0; i < unit[0].length && n > 0; i++) {
    let p = '';
    for (let j = 0; j < unit[1].length && n > 0; j++) {
      p = digit[n % 10] + unit[1][j] + p;
      n = Math.floor(shiftLeft(n, 1));
    }
    s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
  }
  return head + s.replace(/(零.)*零元/, '元')
    .replace(/(零.)+/g, '零')
    .replace(/^整$/, '零元整');
}
// 向右移位
function shiftRight(number, digit){
  digit = parseInt(digit, 10)
  let value = number.toString().split('e')
  return +(value[0] + 'e' + (value[1] ? (+value[1] + digit) : digit))
}
// 向左移位
function shiftLeft(number, digit){
  digit = parseInt(digit, 10)
  let value = number.toString().split('e')
  return +(value[0] + 'e' + (value[1] ? (+value[1] - digit) : -digit))
}