数字金额（字符串）转换汉字数字金额

var convertCurrent = function(currencyDigits){
    var MAXIMUM_NUMBER = 99999999999.99;    //设置最大值

    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;    //Represent integral part of digit number
    var decimal;    //Represent decimal part of digit number
    var outputCharacters;    //The output result
    var parts;
    var digits, radices, bigRadices, decimals;
    var zeroCount;
    var i, p, d;
    var quotient, modulus;

    currencyDigits = currencyDigits.toString();
    if(currencyDigits == ""){
        return "请输入金额！";
    }
    if(currencyDigits.match(/[^,.\d]/) != null){
        return "请输入有效数字";
    }
    if(currencyDigits.match(/^((\d{1,3}(,\d{3})*(.((\d{3},)*\d{1,3}))?)|(\d+(.\d+)?))$/) == null){
        return "数字格式错误";
    }
    currencyDigits = currencyDigits.replace(/,/g, "");    //Remove comma delimiters
    currencyDigits = currencyDigits.replace(/^0+/, "");    //Trim zeros at the beginning
    if(Number(currencyDigits) > MAXIMUM_NUMBER){
        return "您输入的数字太大了";
    }
    parts = currencyDigits.split(".");
    if(parts.length>1){
        integral = parts[0];
        decimal = parts[1];
        decimal = decimal.substr(0,2);    //限制两位有效数字
    }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);
    outputCharacters = "";
    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);
            outputCharacters += digits[Number(d)] + decimals[i];
        }
    }
    if(outputCharacters == ""){
        outputCharacters = CN_ZERO + CN_DOLLAR;
    }
    if(decimal == ""){
        outputCharacters += CN_INTEGER;
    }
    outputCharacters = outputCharacters;
    return outputCharacters;
}