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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人民币数字转换成大写形式

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