js 阿拉伯数字转换中文数字

可以使用以下代码将阿拉伯数字转换为中文数字：

function numberToChinese(num) {
  var cnNums = ["零", "一", "二", "三", "四", "五", "六", "七", "八", "九"];
  var cnIntUnits = ["", "万", "亿", "万亿"];
  var cnIntRadice = ["", "十", "百", "千"];
  var cnDecUnits = ["角", "分", "毫", "厘"];
  var cnIntLast = "元";
  var maxNum = 999999999999999.9999;
  var integerNum;
  var chineseStr = "";
  var parts;

  if (num === "") {
    return "";
  }

  num = parseFloat(num);
  if (num >= maxNum) {
    return "";
  }
  if (isNaN(num)) {
    return "";
  }

  integerNum = Math.floor(num);
  if (integerNum === 0) {
    chineseStr = cnNums[0] + cnIntLast;
    return chineseStr;
  }

  var intStr = integerNum.toString();
  var len = intStr.length;
  var i, j;
  if (len > 15) {
    return "";
  }

  parts = new Array(len);
  for (i = 0; i < len; i++) {
    parts[i] = parseInt(intStr.charAt(i), 10);
  }

  var partLen = Math.ceil(len / 4);
  var partChinese;
  for (i = 0; i < partLen; i++) {
    partChinese = "";
    for (j = 0; j < 4; j++) {
      if (parts[i * 4 + j] === 0) {
        continue;
      }
      partChinese += cnNums[parts[i * 4 + j]] + cnIntRadice[4 - j - 1];
    }
    partChinese += cnIntUnits[partLen - i - 1];
    chineseStr += partChinese;
  }

  if (num.toString().indexOf(".") !== -1) {
    var decNum = num.toString().split(".")[1];
    var decLen = decNum.length;
    for (i = 0; i < decLen; i++) {
      if (i > 3) {
        break;
      }
      chineseStr += cnNums[parseInt(decNum.charAt(i), 10)] + cnDecUnits[i];
    }
  }

  if (chineseStr === "") {
    chineseStr += cnNums[0] + cnIntLast;
  } else if (num < 1) {
    chineseStr = cnNums[0] + chineseStr;
  }

  return chineseStr;
}

使用示例：

console.log(numberToChinese(123456789)); // 一亿二千三百四十五万六千七百八十九元
console.log(numberToChinese(100000001)); // 一亿零一元
console.log(numberToChinese(0.5)); // 五角