获取鼠标位置

$('body').mousemove(function (e) {
            var xx = e.originalEvent.x || e.originalEvent.layerX || 0;
            var yy = e.originalEvent.y || e.originalEvent.layerY || 0;

            $("div.popover").css({
                position: "absolute", left: xx + 20,
                top: yy - 25
            });
        });