javascript 实现RMB转大写

Posted 2022-07-05 zhangjianying

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 = "";
    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 == "") 
        return "不能为空!";
    
    if (currencyDigits.match(/[^,.\\d]/) != null) 
        return "请输入数字!";
    
    if ((currencyDigits).match(/^((\\d1,3(,\\d3)*(.((\\d3,)*\\d1,3))?)|(\\d+(.\\d+)?))$/) == null) 
        return "请输入正确数字!";
    
    
// 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) 
        return "超出了最大数字转换!";
    
    
// 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];
                zeroCount = 0;
            
        
        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;

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