人民币数字转换成大写形式

运用了正则表达式的功能，除了可以正确的转换成人民币的大写形式以外，还可以判断输入的形式是否正确有效。

<！DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="gb2312"> <head> <title>将人民币数字转换成大写形式</title> <script language="jscript">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]; } } 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>

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