js数字金额大写转换

js数字金额大写转换，传入值number类型或string类型

export function convertNumberToChinese(amount: number | string) {
  let n = Number(amount)
  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 ? '欠' : ''
  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')
  )
}

移位的优化，防止出现精度不准的问题

// 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))
}

输出结果

//柒仟陆佰捌拾贰元壹分
console.log(digitUppercase(7682.01))
 //柒仟陆佰捌拾贰元整
console.log(digitUppercase(7682))
 //玖仟伍佰壹拾肆亿叁仟肆佰陆拾柒万柒仟陆佰捌拾贰元整
console.log(digitUppercase(951434677682.00))