js实现金额小写转大写

 function convertCurrency(currencyDigits) {
     var MAXIMUM_NUMBER = 1000000000000.00;

     var CN_ZERO = "零";
     var CN_ONE = "壹";
     var CN_TWO = "贰";
     var CN_THREE = "叁";
     var CN_FOUR = "肆";
     var CN_FIVE = "伍";
     var CN_SIX = "陆";
     var CN_SEVEN = "柒";
     var CN_EIGHT = "捌";
     var CN_NINE = "玖";
     var CN_TEN = "拾";
     var CN_HUNDRED = "佰";
     var CN_THOUSAND = "仟";
     var CN_TEN_THOUSAND = "万";
     var CN_HUNDRED_MILLION = "亿";
     var CN_SYMBOL = "人民币";
     var CN_DOLLAR = "元";
     var CN_TEN_CENT = "角";
     var CN_CENT = "分";
     var CN_INTEGER = "整";

     var integral;    // integral part
     var decimal;     // decimal part
     var outputCharacters = "";    // result.
     var parts;
     var digits, radices, bigRadices, decimals;
     var zeroCount;
     var i, p, d;
     var quotient, modulus;

     if (currencyDigits != null) {
         currencyDigits = currencyDigits.toString();
         currencyDigits = currencyDigits.replace(/,/g, "");    // Remove comma delimiters.
         currencyDigits = currencyDigits.replace(/^0+/, "");   // Trim zeros at the beginning. 

         if (Number(currencyDigits) < MAXIMUM_NUMBER) {
             if (Number(currencyDigits) < 0) {
                 outputCharacters += "负";
                 currencyDigits = Math.abs(Number(currencyDigits)).toString();
             }

             parts = currencyDigits.split("."); // separate the number by decimal point
             if (parts.length > 1) {
                 integral = parts[0];
                 decimal = parts[1];
                 decimal = decimal.substr(0, 2);// two decimal places
             } else {
                 integral = parts[0];
                 decimal = "";
             }

             digits = new Array(CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT, CN_NINE);
             radices = new Array("", CN_TEN, CN_HUNDRED, CN_THOUSAND);
             bigRadices = new Array("", CN_TEN_THOUSAND, CN_HUNDRED_MILLION);
             decimals = new Array(CN_TEN_CENT, CN_CENT);

             if (Number(integral) > 0) {
                 zeroCount = 0;
                 for (i = 0; i < integral.length; i++) {
                     p = integral.length - i - 1;
                     d = integral.substr(i, 1);
                     quotient = p / 4;
                     modulus = p % 4;
                     if (d == "0") {
                         zeroCount++;
                     } else {
                         if (zeroCount > 0) {
                             outputCharacters += digits[0];
                         }
                         zeroCount = 0;
                         outputCharacters += digits[Number(d)] + radices[modulus];
                     }
                     if (modulus == 0 && zeroCount < 4) {
                         outputCharacters += bigRadices[quotient];
                     }
                 }
                 outputCharacters += CN_DOLLAR;
             }

             if (decimal != "") {
                 for (i = 0; i < decimal.length; i++) {
                     d = decimal.substr(i, 1);
                     if (d != "0") {
                         outputCharacters += digits[Number(d)] + decimals[i];
                     }
                 }
             }
             if (outputCharacters == "") {
                 outputCharacters = CN_ZERO + CN_DOLLAR;
             }
             if (decimal == "") {
                 outputCharacters += CN_INTEGER;
             }
             outputCharacters = "" + outputCharacters + "";
         }
     }
     return outputCharacters;
 }