今天在博客园上看到了有人贴了 人民币大写转化函数（C#版） ，于是也顺便把自己以前的写的JavaScript版的转换函数贴出来，相互参考和学习一下。
该函数完成如下功能：
1、对一给定字符串，如：1234.55，转换成正确的中文货币描述：如：人民币壹仟贰佰叁拾四元五角五分
2、输入的字符串形式可以是以下几种：带分隔符的，如：123,456,789.00；不带分隔符的，如：123456789
3、输出的中文货币描述要符合规范，如：0.3----人民币三角；0.33----人民币三角三分；1----人民币壹元整
100----人民币壹佰元整；1001----人民币壹仟零壹元整；10000001----人民币壹仟万零壹元整；
10010001----人民币壹仟零壹万零壹元整，等
4、最大转换能到百亿
下面是运行效果：
具体的代码如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title></title> <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR"> <meta content="VisualStudio.HTML" name="ProgId"> <meta content="Microsoft Visual Studio .NET 7.1" name="Originator"> <script language="jscript"> /***************************************** Copyright (c) 2004, Laser Lu http://www.idow.net *****************************************/ function convertCurrency(currencyDigits) { // Constants: var MAXIMUM_NUMBER = 99999999999.99; // Predefine the radix characters and currency symbols for output: 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"; // Variables: 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; // Validate input string: currencyDigits = currencyDigits.toString(); if (currencyDigits == "") { alert("Empty input!"); return ""; } if (currencyDigits.match(/[^,.\d]/) != null) { alert("Invalid characters in the input string!"); return ""; } if ((currencyDigits).match(/^((\d{1,3}(,\d{3})*(.((\d{3},)*\d{1,3}))?)|(\d+(.\d+)?))$/) == null) { alert("Illegal format of digit number!"); return ""; } // Normalize the format of input digits: currencyDigits = currencyDigits.replace(/,/g, ""); // Remove comma delimiters. currencyDigits = currencyDigits.replace(/^0+/, ""); // Trim zeros at the beginning. // Assert the number is not greater than the maximum number. if (Number(currencyDigits) > MAXIMUM_NUMBER) { alert("Too large a number to convert!"); return ""; } // Process the coversion from currency digits to characters: // Separate integral and decimal parts before processing coversion: parts = currencyDigits.split("."); if (parts.length > 1) { integral = parts[0]; decimal = parts[1]; // Cut down redundant decimal digits that are after the second. decimal = decimal.substr(0, 2); } else { integral = parts[0]; decimal = ""; } // Prepare the characters corresponding to the digits: 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); // Start processing: outputCharacters = ""; // Process integral part if it is larger than 0: 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; } // Process decimal part if there is: if (decimal != "") { for (i = 0; i < decimal.length; i++) { d = decimal.substr(i, 1); if (d != "0") { outputCharacters += digits[Number(d)] + decimals[i]; } } } // Confirm and return the final output string: if (outputCharacters == "") { outputCharacters = CN_ZERO + CN_DOLLAR; } if (decimal == "") { outputCharacters += CN_INTEGER; } outputCharacters = CN_SYMBOL + outputCharacters; return outputCharacters; } </script> </head> <body> <INPUT id="Digits" type="text" name="Digits" size=20> <INPUT id="Convert" type="button" value="Convert" name="Convert" onclick="Result.value = convertCurrency(Digits.value);"> <INPUT id="Result" type="text" name="Result" size=60> </body> </html> 
