round off decimal using javascript

Question

I need to round off the decimal value to decimal places using javascript.

Ex,:

16.181 to 16.18
16.184 to 16.18
16.185 to 16.19
16.187 to 16.19

I have found some answers, but most of them do not round off 16.185 to 16.19..

Answer 1

(Math.round((16.185*Math.pow(10,2)).toFixed(1))/Math.pow(10,2)).toFixed(2);

If your value is, for example 16.199 normal round will return 16.2... but with this method youll get last 0 too, so you see 16.20! But keep in mind that the value will returned as string. If you want to use it for further operations, you have to parsefloat it :)

And now as function:

function trueRound(value, digits){
    return (Math.round((value*Math.pow(10,digits)).toFixed(digits-1))/Math.pow(10,digits)).toFixed(digits);
}

Answer 2

Thanks @ayk for your answer, I modified your function into this :

function trueRound(value, digits){
    return ((Math.round((value*Math.pow(10,digits)).toFixed(digits-1))/Math.pow(10,digits)).toFixed(digits)) * 1;
}

just add " *1 " because with yours, as you wrote, 16.2 becomes 16.20 and I don't need the zero in the back.