JS之金额转换为大写

金额转换为大写函数如下：

export function convertToChineseCapital(n) {
  if (n == 0) {
    return "零";
  }
  if (!/^(\+|-)?(0|[1-9]\d*)(\.\d+)?$/.test(n))
    return "数据非法";
  var unit = "仟佰拾亿仟佰拾万仟佰拾元角分", str = "";
  n += "00";
  var a = parseFloat(n);
  if (a < 0) {
    n = n.substr(1);
  }
  var p = n.indexOf('.');
  if (p >= 0) {
    n = n.substring(0, p) + n.substr(p + 1, 2);
  }

  unit = unit.substr(unit.length - n.length);

  for (var i = 0; i < n.length; i++)
    str += '零壹贰叁肆伍陆柒捌玖'.charAt(n.charAt(i)) + unit.charAt(i);
  if (a > 0) {
    return str.replace(/零(仟|佰|拾|角)/g, "零").replace(/(零)+/g, "零").replace(/零(万|亿|元)/g, "$1").replace(/(亿)万|壹(拾)/g, "$1$2").replace(/^元零?|零分/g, "").replace(/元$/g, "元整");

  } else {

    return "负" + str.replace(/零(仟|佰|拾|角)/g, "零").replace(/(零)+/g, "零").replace(/零(万|亿|元)/g, "$1").replace(/(亿)万|壹(拾)/g, "$1$2").replace(/^元零?|零分/g, "").replace(/元$/g, "元整");
  }
}

 

2026-06-09优化（增加毫厘）：

export function convertCurrency(money) {
  const cnNums = ["零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"];
  const cnIntRadice = ["", "拾", "佰", "仟"];
  const cnIntUnits = ["", "万", "亿", "兆"];
  const cnDecUnits = ["角", "分", "毫", "厘"];
  const cnInteger = "整";
  const cnIntLast = "元";
  let maxNum = 999999999999999.9999;
  let integerNum, decimalNum, chineseStr = "", parts, isNegative = false;
  if (money === "") return "";
  money = parseFloat(money);
  if (money < 0) {
    isNegative = true;
    money = Math.abs(money);
  }
  if (money >= maxNum) return "";
  if (money === 0) {
    chineseStr = cnNums[0] + cnIntLast + cnInteger;
    return isNegative ? "负" + chineseStr : chineseStr;
  }
  money = money.toString();
  if (money.indexOf(".") === -1) {
    integerNum = money;
    decimalNum = "";
  } else {
    parts = money.split(".");
    integerNum = parts[0];
    decimalNum = parts[1].substr(0, 4);
  }
  if (parseInt(integerNum, 10) > 0) {
    var zeroCount = 0;
    var IntLen = integerNum.length;
    for (let i = 0; i < IntLen; i++) {
      let n = integerNum.substr(i, 1);
      let p = IntLen - i - 1;
      let q = p / 4;
      let m = p % 4;
      if (n == "0") {
        zeroCount++;
      } else {
        if (zeroCount > 0) chineseStr += cnNums[0];
        zeroCount = 0;
        chineseStr += cnNums[parseInt(n)] + cnIntRadice[m];
      }
      if (m == 0 && zeroCount < 4) chineseStr += cnIntUnits[q];
    }
    chineseStr += cnIntLast;
  }
  if (decimalNum !== "") {
    let decLen = decimalNum.length;
    for (let i = 0; i < decLen; i++) {
      let n = decimalNum.substr(i, 1);
      if (n !== "0") chineseStr += cnNums[Number(n)] + cnDecUnits[i];
    }
  }
  if (chineseStr === "") {
    chineseStr += cnNums[0] + cnIntLast + cnInteger;
  } else if (decimalNum === "") {
    chineseStr += cnInteger;
  }
  return isNegative ? "负" + chineseStr : chineseStr;
}