输入数字转换为大写
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(outputCharacters.lastIndexOf("分")==-1){
??outputCharacters += CN_INTEGER;
?}
?outputCharacters = outputCharacters;
?return outputCharacters;
}
