function add(arg1, arg2){

    let decima1, decima2, differ, m;

　  try { decima1 = arg1.toString().split('.')[1].length } catch(err) {

         decima1 = 0

    }

    try { decima2 = arg2.toString().split('.')[1].length } catch (err) {

         decima2 = 0

    }

    differ = Math.abs(decima1 - decima2)

    m = Math.pow(10, Math.max(decima1, decima2))

    if(differ > 0) {

        let differM = Math.pow(10, differ)

        if(decima1 > decima2) {

           arr1= Number(arg1.toString().replace('.', ''))

           arr2 = Number(arg2.toString().replace('.', '')) * differM

        } else {

           arr1 = Number(arg1.toString().replace('.', '')) * differM

           arr2 = Number(arg2.toString().replace('.', ''))

        }

    }  else {

        arr1 = Number(arg1.toString().replace('.',''))

        arr2 = Number(arg2.toString().replace('.', ''))

    }

    return (arg1 + arg2) / m

 }