JS-Accurate Subtraction

(function () {    varCalc = {        /*A function, an addition function, is used to obtain an accurate addition: the result of the addition of JavaScript will be error, and it will be more obvious when the two floating-point numbers are added.        This function returns a more accurate addition result. Parameters: Arg1: The first addend; arg2 the second addend; d the number of decimal digits to retain (which can be passed without this parameter, if not processed) call: Calc.add (ARG1,ARG2,D) return value: Result of two number addition*/ADD:function(Arg1, arg2) {arg1= Arg1.tostring (), arg2 =arg2.tostring (); varArg1arr = Arg1.split ("."), Arg2arr = Arg2.split ("."), D1 = Arg1arr.length = = 2? ARG1ARR[1]: "", d2 = Arg2arr.length = = 2? ARG2ARR[1]: ""; varMaxLen =Math.max (D1.length, d2.length); varm = Math.pow (10, MaxLen); varresult = Number ((ARG1 * m + arg2 * m)/m). ToFixed (MaxLen)); varD = arguments[2]; return typeofD = = = "Number"?Number (Result). ToFixed (d)): result; },        /*function: The subtraction function, which is used to obtain the exact subtraction result: The function returns a more accurate subtraction result. Parameters: Arg1: The first addend; arg2 the second addend; d the number of decimal digits to retain (this parameter can not be passed, if not, the scale call is not processed: calc.sub (ARG1,ARG2) return value: Two number subtraction result*/Sub:function(Arg1, arg2) {returnCalc.add (Arg1,-number (arg2), arguments[2]); },        /*function: The multiplication function, which is used to get the exact multiplication result, shows that the function returns the more accurate multiplication result. Parameters: Arg1: the first multiplier; arg2 the second multiplier; d the number of decimal digits to retain (which can be passed without this argument, if not processed) call: Calc.mul (ARG1,ARG2) return value: The result of multiplying by two number*/Mul:function(Arg1, arg2) {varR1 = arg1.tostring (), r2 = Arg2.tostring (), M, resultval, d = arguments[2]; M= (R1.split (".") [1]? R1.split (".") [1].length:0) + (R2.split (".") [1]? R2.split (".") [1].length:0); Resultval= Number (R1.replace (".", "")) * Number (R2.replace (".", ""))/Math.pow (10, M); return typeofD!== "number"?Number ( Resultval): Number (resultval.tofixed (parseint (d))); },        /*function: The division function, which is used to get the exact division result: The function returns a more accurate division result. Parameters: Arg1: Divisor, arg2 divisor, d number of decimal digits to retain (can not pass this parameter, if not to handle decimal digits) Call: Calc.div (ARG1,ARG2) return value: arg1 result except arg2*/Div:function(Arg1, arg2) {varR1 = arg1.tostring (), r2 = Arg2.tostring (), M, resultval, d = arguments[2]; M= (R2.split (".") [1]? R2.split (".") [1].length:0)-(R1.split (".") [1]? R1.split (".") [1].length:0); Resultval= Number (R1.replace (".", ""))/Number (R2.replace (".", "")) * MATH.POW (10, M); return typeofD!== "number"?Number ( Resultval): Number (resultval.tofixed (parseint (d)));    }    }; Window. Calc=Calc;} ());

I've already tested it, you can use it directly.

JS-Accurate Subtraction