js 数字转汉字

以下是 JavaScript 实现将数字转换为汉字的代码：

function numberToChinese(num) {
  if (isNaN(num)) return "";
  const units = ["零", "一", "二", "三", "四", "五", "六", "七", "八", "九"];
  const unitChars = ["", "十", "百", "千"];
  const bigUnitChars = ["", "万", "亿", "兆"];
  let result = "";
  let numStr = num.toString();
  let len = numStr.length;
  let zeroFlag = true;
  let pos = 0;
  while (len > 0) {
    let cur = parseInt(numStr.charAt(pos));
    let curChar = units[cur];
    let unitChar = unitChars[len - 1];
    if (cur === 0) {
      if (!zeroFlag) {
        result += curChar;
        zeroFlag = true;
      }
    } else {
      result += curChar + unitChar;
      zeroFlag = false;
    }
    pos++;
    len--;
    if (len === 0 && pos < numStr.length) {
      let bigUnitChar = bigUnitChars[Math.ceil(pos / 4)];
      result += bigUnitChar;
      len = numStr.length - pos;
    }
  }
  return result;
}

使用方法：

console.log(numberToChinese(123456789)); // 输出：一亿二千三百四十五万六千七百八十九