Examples of precise calculations of addition and subtraction in js_javascript skills

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;idataOneFloat ="0";
}
for(var i=0;idataTwoFloat ="0";
}

/**
* Multiply the two data
* to make them both integers. Because integer calculation
* is more accurate.
*/
var one=dataOneInt "" dataOneFloat;
var two=dataTwoInt "" dataTwoFloat;
//alert("dataOne:" dataOne " dataTwo:" dataTwo " one:" one " two:" two);

/**
*After the data is expanded by a multiple, the calculated result is obtained,
*and then reduced by the same multiple
* to obtain the correct result
*/
var result= (Number(one) Number(two))/Math.pow(10,maxLength);

return result;

}