Round number in javascript

//——- Rounding in javascript ——–
//@param: Number, length to round
//@return: Rounded number

function roundNumber(rnum, rlength) 

{
// Arguments: number to round, number of decimal places
  var newnumber = Math.round(rnum*Math.pow(10,rlength))/Math.pow(10,rlength);
    newNumber = parseFloat(newnumber); // Output the result to the form field (change for your purposes)
    return newNumber;
}

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