//说明：javascript的加法结果会有误差，在两个浮点数相加的时候会比较明显。这个函数返回较为精确的加法结果。

//调用：accAdd(arg1,arg2)

//返回值：arg1加上arg2的精确结果

function accAdd(arg1, arg2) {

    var r1, r2, m;

    try {

        r1 = (1 * arg1).toString().split(".")[1].length;

    }

    catch (e) {

        r1 = 0;

    }

    try {

        r2 = (1 * arg2).toString().split(".")[1].length;

    }

    catch (e) {

        r2 = 0;

    }

    m = Math.pow(10, Math.max(r1, r2));

    return (arg1 * m + arg2 * m) / m;

}      

//说明：javascript的减法结果会有误差，在两个浮点数相加的时候会比较明显。这个函数返回较为精确的减法结果。

//调用：accSub(arg1,arg2)

//返回值：arg1减上arg2的精确结果

function accSub(arg1, arg2) {

    return accAdd(arg1, -arg2);

}      

//说明：javascript的乘法结果会有误差，在两个浮点数相乘的时候会比较明显。这个函数返回较为精确的乘法结果。

//调用：accMul(arg1,arg2)

//返回值：arg1乘以arg2的精确结果

function accMul(arg1, arg2) {

    var m = 0, s1 = (1 * arg1).toString(), s2 = (1 * arg2).toString();

    try {

        m += s1.split(".")[1].length;

    }

    catch (e) {

    }

    try {

        m += s2.split(".")[1].length;

    }

    catch (e) {

    }

    var ss = Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m);

    return Math.round(ss * 100) / 100;

}      

//说明：javascript的除法结果会有误差，在两个浮点数相除的时候会比较明显。这个函数返回较为精确的除法结果。

//调用：accDiv(arg1,arg2)

//返回值：arg1除以arg2的精确结果

function accDiv(arg1, arg2) {

    var t1 = 0, t2 = 0, r1, r2;

    try {

        t1 = (1 * arg1).toString().split(".")[1].length;

    }

    catch (e) {

    }

    try {

        t2 = (1 * arg2).toString().split(".")[1].length;

    }

    catch (e) {

    }

    with (Math) {

        r1 = Number((1 * arg1).toString().replace(".", ""));

        r2 = Number((1 * arg2).toString().replace(".", ""));

        var ss = (r1 / r2) * pow(10, t2 - t1);

        return Math.round(ss * 100) / 100;

    }

}

//金额大小写转换

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 "";

}

// http://www.knowsky.com/ 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;

outputCharacters = outputCharacters;

return outputCharacters;

}//

//还原金额

function rmoney(s){

    return parseFloat(s.replace(/[^\d\.-]/g,""));

}     

//金额合计的格式化s为要格式化的参数（浮点型），n为小数点后保留的位数

function fmoney(s,n){

    n = n>0 && n<=20 ? n : 2;

    s = parseFloat((s+"").replace(/[^\d\.-]/g,"")).toFixed(n)+"";

    var l = s.split(".")[0].split("").reverse(),

    r = s.split(".")[1];

    t = "";

    for(i = 0;i<l.length;i++){

        t+=l[i]+((i+1)%3==0 && (i+1) != l.length ? "," : "");

    }

    return t.split("").reverse().join("")+"."+r;

}