js加减乘除精度问题

加:

function accAdd(arg1,arg2){
         var r1,r2,m;
          try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0}
          try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0}
           m=Math.pow(10,Math.max(r1,r2))
          return (arg1*m+arg2*m)/m
}

减:

乘：

function accMul(arg1, arg2)
{
var m = 0, s1 = arg1.toString(), s2 = arg2.toString();
try { m += s1.split(".")[1].length } catch (e) { }
try { m += s2.split(".")[1].length } catch (e) { }
return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m)
}

除:

function accDiv(arg1, arg2)
{
var t1 = 0, t2 = 0, r1, r2;
try { t1 = arg1.toString().split(".")[1].length } catch (e) { }
try { t2 = arg2.toString().split(".")[1].length } catch (e) { }
with (Math) {
r1 = Number(arg1.toString().replace(".", ""))
r2 = Number(arg2.toString().replace(".", ""))
return (r1 / r2) * pow(10, t2 - t1);
}
}