人民币工具类

RmbUtils = {
    convertCurrency: function (currencyDigits) {
        //常量
        var MAXIMUM_NUMBER = 99999999999.99;
        //预先定义输出的基数字符和货币符号:
        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 = "";
        var CN_DOLLAR = "元";
        var CN_TEN_CENT = "角";
        var CN_CENT = "分";
        var CN_INTEGER = "整";
        // 变量:
        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;
        // 校验输入字符串:
        currencyDigits = currencyDigits.toString();
        if (currencyDigits == "") {
            alert("不能为空。");
            return false;
        }
        if (currencyDigits.match(/[^,.\d]/) != null) {
            alert("请输入数字。");
            return '';
        }
        if ((currencyDigits).match(/^((\d{1,3}(,\d{3})*(.((\d{3},)*\d{1,3}))?)|(\d+(.\d+)?))$/) == null) {
            alert("请输入正确数字。");
            return false;
        }
        // 将输入数字的格式标准化
        currencyDigits = currencyDigits.replace(/,/g, ""); // Remove comma delimiters.
        currencyDigits = currencyDigits.replace(/^0+/, ""); // Trim zeros at the beginning.
        // 超出了最大数字转换
        if (Number(currencyDigits) > MAXIMUM_NUMBER) {
            alert("超出了最大数字转换。");
            return false;
        }
        //处理货币数字到字符的转换
        // 将积分部分和小数部分分开
        parts = currencyDigits.split(".");
        if (parts.length > 1) {
            integral = parts[0];
            decimal = parts[1];
            // 小数保留2位.
            decimal = decimal.substr(0, 2);
        } else {
            integral = parts[0];
            decimal = "";
        }
        // 准备数字对应的字符
        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);
        //开始处理
        outputCharacters = "";
        // 处理整数部分
        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];
                    zeroCount = 0;
                }
            }
            outputCharacters += CN_DOLLAR;
        }
        // 处理小数部分
        if (decimal != "") {
            for (i = 0; i < decimal.length; i++) {
                d = decimal.substr(i, 1);
                if (d != "0") {
                    outputCharacters += digits[Number(d)] + decimals[i];
                }
            }
        }
        // 确认并返回处理结果
        if (outputCharacters == "") {
            outputCharacters = CN_ZERO + CN_DOLLAR;
        }
        if (decimal == "") {
            outputCharacters += CN_INTEGER;
        }
        outputCharacters = CN_SYMBOL + outputCharacters;
        return outputCharacters;
    }
}