开放原子开发者工作坊

 
    
      1  
    function convertCurrency(currencyDigits) { 
    
 
      2      
    // 
    Constants:  
    
 
      3  
         
    var MAXIMUM_NUMBER = 99999999999.99; 
    
 
      4      
    // 
    Predefine the radix characters and currency symbols for output:  
    
 
      5  
         
    /* 
    
 
      6  
        var CN_ZERO = "零";
 
      7  
        var CN_ONE = "壹";
 
      8  
        var CN_TWO = "贰";
 
      9  
        var CN_THREE = "叁";
 
     10  
        var CN_FOUR = "肆";
 
     11  
        var CN_FIVE = "伍";
 
     12  
        var CN_SIX = "陆";
 
     13  
        var CN_SEVEN = "柒";
 
     14  
        var CN_EIGHT = "捌";
 
     15  
        var CN_NINE = "玖";
 
     16  
        var CN_TEN = "拾";
 
     17  
        var CN_HUNDRED = "佰";
 
     18  
        var CN_THOUSAND = "仟";
 
     19  
        var CN_TEN_THOUSAND = "万";
 
     20  
        var CN_HUNDRED_MILLION = "亿";
 
     21  
        var CN_SYMBOL = "人民币";
 
     22  
        var CN_DOLLAR = "元";
 
     23  
        var CN_TEN_CENT = "角";
 
     24  
        var CN_CENT = "分";
 
     25  
        var CN_INTEGER = "整";
 
     26  
         
    */ 
    
 
     27  
    
 
     28      
    var CN_ZERO = "零"; 
    
 
     29      
    var CN_ONE = "一"; 
    
 
     30      
    var CN_TWO = "二"; 
    
 
     31      
    var CN_THREE = "三"; 
    
 
     32      
    var CN_FOUR = "四"; 
    
 
     33      
    var CN_FIVE = "五"; 
    
 
     34      
    var CN_SIX = "六"; 
    
 
     35      
    var CN_SEVEN = "七"; 
    
 
     36      
    var CN_EIGHT = "八"; 
    
 
     37      
    var CN_NINE = "九"; 
    
 
     38      
    var CN_TEN = "十"; 
    
 
     39      
    var CN_HUNDRED = "百"; 
    
 
     40      
    var CN_THOUSAND = "千"; 
    
 
     41      
    var CN_TEN_THOUSAND = "万"; 
    
 
     42      
    var CN_HUNDRED_MILLION = "亿"; 
    
 
     43      
    var CN_SYMBOL = "人民币"; 
    
 
     44      
    var CN_DOLLAR = "元"; 
    
 
     45      
    var CN_TEN_CENT = "角"; 
    
 
     46      
    var CN_CENT = "分"; 
    
 
     47      
    var CN_INTEGER = "整"; 
    
 
     48  
    
 
     49      
    // 
    Variables:  
    
 
     50  
         
    var integral; 
    
 
     51      
    // 
    Represent integral part of digit number. 
    
 
     52  
         
    var decimal; 
    
 
     53      
    // 
    Represent decimal part of digit number. 
    
 
     54  
         
    var outputCharacters; 
    
 
     55      
    // 
    The output result.  
    
 
     56  
         
    var parts; 
    
 
     57      
    var digits, radices, bigRadices, decimals; 
    
 
     58      
    var zeroCount; 
    
 
     59      
    var i, p, d; 
    
 
     60      
    var quotient, modulus; 
    
 
     61      
    // 
    Validate input string: 
    
 
     62  
        currencyDigits = currencyDigits.toString(); 
    
 
     63      
    if (currencyDigits == "") { alert("Empty input!");  
    return ""; } 
    
 
     64      
    if (currencyDigits.match(/[^,.\d]/) !=  
    null) { alert("Invalid characters in the input string!");  
    return ""; } 
    
 
     65      
    if ((currencyDigits).match(/^((\d{1,3}(,\d{3})*(.((\d{3},)*\d{1,3}))?)|(\d+(.\d+)?))$/) ==  
    null) { alert("Illegal format of digit number!");  
    return ""; } 
    
 
     66      
    // 
    Normalize the format of input digits: 
    
 
     67  
        currencyDigits = currencyDigits.replace(/,/g, ""); 
    
 
     68      
    // 
    Remove comma delimiters. 
    
 
     69  
        currencyDigits = currencyDigits.replace(/^0+/, ""); 
    
 
     70      
    // 
    Trim zeros at the beginning.//Assert the number is not greater than the maximum number.  
    
 
     71  
         
    if (Number(currencyDigits) > MAXIMUM_NUMBER) { alert("Too large a number to convert!");  
    return ""; } 
    
 
     72      
    // 
    Process the coversion from currency digits to characters: 
    
 
     73  
         
    // 
    Separate integral and decimal parts before processing coversion: 
    
 
     74  
        parts = currencyDigits.split("."); 
    
 
     75      
    if (parts.length > 1) { 
    
 
     76         integral = parts[0]; decimal = parts[1]; 
    
 
     77          
    // 
    Cut down redundant decimal digits that are after the second. 
    
 
     78  
            decimal = decimal.substr(0, 2); 
    
 
     79     }  
    else { integral = parts[0]; decimal = ""; } 
    
 
     80      
    // 
    Prepare the characters corresponding to the digits: 
    
 
     81  
        digits =  
    new Array(CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT, CN_NINE); 
    
 
     82     radices =  
    new Array("", CN_TEN, CN_HUNDRED, CN_THOUSAND); 
    
 
     83     bigRadices =  
    new Array("", CN_TEN_THOUSAND, CN_HUNDRED_MILLION); 
    
 
     84     decimals =  
    new Array(CN_TEN_CENT, CN_CENT); 
    
 
     85      
    // 
    Start processing: 
    
 
     86  
        outputCharacters = ""; 
    
 
     87      
    // 
    Process integral part if it is larger than 0: 
    
 
     88  
         
    if (Number(integral) > 0) { 
    
 
     89         zeroCount = 0;  
    for (i = 0; i < integral.length; i++) { 
    
 
     90             p = integral.length - i - 1; d = integral.substr(i, 1); quotient = p / 4; modulus = p % 4;  
    if (d == "0") { zeroCount++; } 
    
 
     91              
    else { 
    
 
     92                  
    if (zeroCount > 0) { outputCharacters += digits[0]; } zeroCount = 0; outputCharacters += digits[Number(d)] + radices[modulus]; 
    
 
     93             } 
    
 
     94              
    if (modulus == 0 && zeroCount < 4) { outputCharacters += bigRadices[quotient]; } 
    
 
     95         } 
    
 
     96         outputCharacters += CN_DOLLAR; 
    
 
     97     } 
    
 
     98      
    // 
    Process decimal part if there is: 
    
 
     99  
         
    if (decimal != "") { 
    
 
    100          
    for (i = 0; i < decimal.length; i++) { 
    
 
    101             d = decimal.substr(i, 1); 
    
 
    102              
    if (d != "0") { outputCharacters += digits[Number(d)] + decimals[i]; }  
    
 
    103         }  
    
 
    104     } 
    
 
    105      
    // 
    Confirm and return the final output string:  
    
 
    106  
         
    if (outputCharacters == "") { outputCharacters = CN_ZERO + CN_DOLLAR; } 
    
 
    107      
    if (decimal == "") { outputCharacters += CN_INTEGER; } 
    
 
    108     outputCharacters =CN_SYMBOL + "   " + outputCharacters; 
    
 
    109      
    return outputCharacters; 
    
 
    110 }