用JavaScript写一个数字转汉字的方法

以下是一个简单的 JavaScript 函数，它可以将数字转换为对应的中文数字：

function numberToChinese(num) {
  var cnNums = ["零", "一", "二", "三", "四", "五", "六", "七", "八", "九"];
  var cnIntRadice = ["", "十", "百", "千"];
  var cnIntUnits = ["", "万", "亿", "兆"];
  var cnDecUnits = ["角", "分", "毫", "厘"];
  var cnInteger = "整";
  var cnIntLast = "元";
  var maxNum = 999999999999999.9999;
  var integerNum;
  var chineseStr = "";
  var i = 0;
  var zeroCount = 0;
  var intLen = 0;
  var decLen = 0;
  var parts;
  var decNum;
  var oldCh;

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

  num = parseFloat(num);

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

  if (num == 0) {
    chineseStr = cnNums[0] + cnIntLast + cnInteger;
    return chineseStr;
  }

  if (num < 0) {
    num = -num;
    chineseStr += "负";
  }

  num = num.toString();

  if (num.indexOf(".") == -1) {
    integerNum = num;
    decNum = "";
  } else {
    parts = num.split(".");
    integerNum = parts[0];
    decNum = parts[1].substr(0, 4);
  }

  intLen = integerNum.length;

  for (i = 0; i < intLen; i++) {
    var n = parseInt(integerNum.charAt(i));
    var p = intLen - i - 1;
    var q = p / 4;
    var m = p % 4;

    if (n == 0) {
      zeroCount++;
    } else {
      if (zeroCount > 0) {
        chineseStr += cnNums[0];
      }

      zeroCount = 0;
      chineseStr += cnNums[n] + cnIntRadice[m];
    }

    if (m == 0 && zeroCount < 4) {
      chineseStr += cnIntUnits[q];
      zeroCount = 0;
    }
  }

  if (decNum != "") {
    decLen = decNum.length;

    for (i = 0; i < decLen; i++) {
      var n = parseInt(decNum.charAt(i));

      if (n != 0) {
        chineseStr += cnNums[n] + cnDecUnits[i];
      }
    }
  }

  if (chineseStr == "") {
    chineseStr += cnNums[0];
  }

  chineseStr += cnIntLast;

  if (decNum == "") {
    chineseStr += cnInteger;
  }

  return chineseStr;
}

使用示例：

console.log(numberToChinese(1234567.89)); // 一百二十三万四千五百六十七元八角九分

注意：这个函数只支持处理到 `999999999999999.9999` 的数字，超过这个范围的数字将会返回空字符串。另外，这个函数没有对输入进行严格的校验，如果输入的不是数字字符串，可能会返回错误的结果。