Javascript:将人民币数字转换成大写形式

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用JavaScript编写了一功能函数，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；

1001001----人民币壹仟零壹万零壹元整，等

4、最大转换能到百亿

具体的代码如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>

<head>

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>

</body>

</html>

以上代码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。

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