Example of exact addition and subtraction in js

/Accurately calculate addition and subtraction. For example, 0.1 + 0.2 = 0.3 or 0.1-0.2 =-0.1
Copy codeThe Code is as follows:
Function addFn (dataOne, dataTwo ){

Var dataOneInt = dataOne. toString (). split (".") [0];
Var dataOneFloat = "";
Var dataTwoInt = dataTwo. toString (). split (".") [0];
Var dataTwoFloat = "";
Var lengthOne = 0;
Var lengthTwo = 0;
Var maxlength = 0;

If (dataOne. toString (). split ("."). length = 2 ){
DataOneFloat = dataOne. toString (). split (".") [1];
LengthOne = dataOneFloat. toString (). length;

}
If (dataTwo. toString (). split ("."). length = 2 ){
DataTwoFloat = dataTwo. toString (). split (".") [1];
LengthTwo = dataTwoFloat. toString (). length;

}

MaxLength = Math. max (lengthOne, lengthTwo );
For (var I = 0; I <maxLength-lengthOne; I ++ ){
DataOneFloat + = "0 ";
}
For (var I = 0; I <maxLength-lengthTwo; I ++ ){
DataTwoFloat + = "0 ";
}

/**
* Multiple amplification of the two data
* Convert all of them to integers. Because integer calculation
* Relatively accurate.
*/
Var one = dataOneInt + "" + dataOneFloat;
Var two = dataTwoInt + "" + dataTwoFloat;
// Alert ("dataOne:" + dataOne + "dataTwo:" + dataTwo + "one:" + one + "two:" + two );

/**
* After the data is multiplied, the calculated result is,
* Then, reduce the number of equal multiples.
* Get the correct result.
*/
Var result = (Number (one) + Number (two)/Math. pow (10, maxLength );

Return result;

}