var rounded = Math.round( number * 10 ) / 10;   // round to one digit

var rounded = Math.round( number * 100 ) / 100;   // round to two digit

function round(value, precision) {

    var multiplier = Math.pow(10, precision || 0);

    return Math.round(value * multiplier) / multiplier;

}

var fixed = rounded.toFixed(1);  // round to one digit

var fixed = rounded.toFixed(2); // round to two digit