Layerui 弹出层的位置设置

距顶 offset: '300px'

例1： layer.msg("请先选择项！", { offset: '300px' });
例2： layer.confirm("确定删除吗", {
                    btn: ['确认', '取消'],
                    offset: '300px'
                    
                }, function (index) {
                    layer.close(index);
                    $.post("feedbacklist.aspx?cmd=del", { "idlist": idlist }, function (resp) {
                        if (resp.res == 1) {
                            window.location.href = location.href; //刷新当前页
                            parent.layer.msg(resp.msg);
                        }
                        layer.msg(resp.msg);

}, "json");
                }, function (index) {
                    layer.close(index);
                });