js实现完美兼容各大浏览器的人民币大小写相互转换

/*小写转大写*/

var xcc= "12.22";
document.write(xcc+"=>"+formatRMB(xcc)+"<br/>");

/*大写转小写*/

var rrrr = "壹拾贰元贰角贰分";
document.write(rrrr+"=>"+parseRMB(rrrr));

输出结果：
12.22=>壹拾贰元贰角贰分
壹拾贰元贰角贰分=>12.22

我们来看下具体实例

var c = "零壹贰叁肆伍陆柒捌玖".split("");
// ["零","壹","贰","叁","肆","伍","陆","柒","捌","玖"]
var _c = {}; // 反向对应关系
for ( var i = 0; i < c.length; i++) {
  _c[c[i]] = i;
};

var d = "元***万***亿***万";
var e = ",拾,佰,仟".split(",");
function unit4(arr) {
  var str = "", i = 0;
  while (arr.length) {
    var t = arr.pop();
    str = (c[t] + (t == 0 ? "" : e[i])) + str;
    i++;
  }

  str = str.replace(/[零]{2,}/g, "零");

  str = str.replace(/^[零]/, "");
  str = str.replace(/[零]$/, "");
  if (str.indexOf("零") == 0) {
    str = str.substring(1);
  }
  if (str.lastIndexOf("零") == str.length - 1) {
    str = str.substring(0, str.length - 1);
  }

  return str;
}
function _formatD(a) {
  // 转化整数部分
  var arr = a.split(""), i = 0, result = "";
  while (arr.length) {
    var arr1 = arr.splice(-4, 4);

    var dw = d.charAt(i), unit = unit4(arr1);

    if (dw == '万' && !unit) {
      dw = "";
    }
    result = unit + dw + result;
    i += 4;
  }
  return result == "元" ? "" : result;
}
function _formatF(b){
   // 转化小数部分
  b = b || "";
  switch (b.length) {
  case 0:
    return "整";
  case 1:
    return c[b] + "角";
  default:
    return c[b.charAt(0)] + "角" + c[b.charAt(1)] + "分";
  }
}
function _format(n){
  var a = ("" + n).split("."), a0 = a[0], a1 = a[1];
  return _formatD(a0) + _formatF(a1);
}

function parse4(u4){
  var res = 0;
  while (t = /([零壹贰叁肆伍陆柒捌玖])([拾佰仟]?)/g.exec(u4)) {
    var n = _c[t[1]], d = {
      "" : 1,
      "拾" : 10,
      "佰" : 100,
      "仟" : 1000
    }[t[2]];
    res += n * d;
    u4 = u4.replace(t[0], "");
  }
  var result = ("0000" + res);
  return result.substring(result.length - 4);
}
function _parseD(d) {
  var arr = d.replace(/[零]/g, "").split(/[万亿]/), rs = "";
  for ( var i = 0; i < arr.length; i++) {
    rs += parse4(arr[i]);
  }
  ;
  return rs.replace(/^[0]+/, "");
};
function _parseF(f) {
  var res = "", t = f.replace(/[^零壹贰叁肆伍陆柒捌玖]+/g, "").split(""); // 去掉单位
  if (t.length) {
    res = ".";
  } else {
    return "";
  }
  ;
  for ( var i = 0; (i < t.length && i < 2); i++) {
    res += _c[t[i]];
  }
  ;
  return res;
};
function _parse(rmb) {
  var a = rmb.split("元"), a1 = a[1], a0 = a[0];
  if (a.length == 1) {
    a1 = a0;
    a0 = "";
  }
  return _parseD(a0) + _parseF(a1);

};
//小写转大写
function formatRMB(num){
  var n = Number(num);
  if(!isNaN(num)){
    if(num == 0){
      return "零元整";
    }else{
      return _format(n);
    }
  }else {
    return false;
  }
}
//大写转小写
function parseRMB(rmb) {
  if (/^[零壹贰叁肆伍陆柒捌玖元万亿拾佰仟角分整]{2,}$/.test(rmb)) {
    var result = _parse(rmb);
    return rmb == this.formatRMB(result) ? result : result + "(?)";
  } else {
    return false;
  }
};
/*小写转大写*/
var xcc= "12.22";
document.write(xcc+"=>"+formatRMB(xcc)+"<br/>");

/*大写转小写*/
var rrrr = "壹拾贰元贰角贰分";
document.write(rrrr+"=>"+parseRMB(rrrr));

再来看一个将RMB转化为大写的例子

//人民币金额转大写程序 JavaScript版
  //CopyRight Bardo QI
  function numToCny(num){
  var capUnit = ['万','亿','万','圆',''];
  var capDigit = { 2:['角','分',''], 4:['仟','佰','拾','']};
  var capNum=['零','壹','贰','叁','肆','伍','陆','柒','捌','玖'];
  if (((num.toString()).indexOf('.') > 16)||(isNaN(num)))
  return '';
  num = (Math.round(num*100)/100).toString();
  num =((Math.pow(10,19-num.length)).toString()).substring(1)+num;
  var i,ret,j,nodeNum,k,subret,len,subChr,CurChr=[];
  for (i=0,ret='';i<5;i++,j=i*4+Math.floor(i/4)){
  nodeNum=num.substring(j,j+4);
  for(k=0,subret='',len=nodeNum.length;((k
  CurChr[k%2] = capNum[nodeNum.charAt(k)]+((nodeNum.charAt(k)==0)?'':capDigit[len][k]);
  if (!((CurChr[0]==CurChr[1]) && (CurChr[0]==capNum[0])))
  if(!((CurChr[k%2] == capNum[0]) && (subret=='') && (ret=='')))
  subret += CurChr[k%2];
  }
  subChr = subret + ((subret=='')?'':capUnit[i]);
  if(!((subChr == capNum[0]) && (ret=='')))
  ret += subChr;
  }
  ret=(ret=='')? capNum[0]+capUnit[3]: ret;
  return ret;
  }