JavaScript: Math.round (modified to round number with decimal places)

gistfile1.js

Math.round = (function() {
    var originalRound = Math.round;
    return function(number, precision) {
        precision = Math.abs(parseInt(precision)) || 0;
        var multiplier = Math.pow(10, precision);
        return (originalRound(number * multiplier) / multiplier);
    };
})();
/*
example usage:
    Math.round(1.2345, 2) // returns 1.23
    Math.round(4.789, 1) // returns 4.8

above modification can be applied to Math.ceil and Math.floor as well    

borrowed from: http://www.anujgakhar.com/2013/06/06/rounding-numbers-with-decimal-places-in-javascript/
*/