JavaScript 动态将数字金额转化为中文大写金额

　　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("您输入的金额太大，请重新输入!");

　　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;

　　}