橫向滾動

//滾動鼠標時 滾動橫向滾動條

$doc.unbind('mousewheel').bind('mousewheel', function (event) {

        if ($doc.outerWidth() > $win.width()) {
            if (event.deltaX === 0) {
                $doc.scrollLeft($doc.scrollLeft() + event.deltaY * event.deltaFactor);
            }
        }
    });