angular获取横向滚动条的scrollLeft距离；

//滑动时二级菜单跟随滑动
zswApp.directive('scrollNav', function () {
    return {
        restrict: "A",
        scope: true,
        link: function ($scope, elm, attr, controller) {
            var navbox=$(".nav_box"); //得到导航对象
            var scrollFn = function(){
                var navbox=$(".nav_box"); //得到导航对象
                $(".nav2_box").css("left",navbox.scrollLeft());
            };
            navbox.on('scroll',scrollFn);
            $scope.$on('$destroy',function(){
                navbox.off('scroll',scrollFn);
            })

        }
    }
});