人民币工具类详解编程语言

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; 
    } 
}