tListener('click',function(){
                    cancelAnimationFrame(timer);
                    let scrollTop = document.documentElement.scrollTop;
                    let move = scrollTop/18;
                    timer = requestAnimationFrame(function fn(){
                        var oTop = document.documentElement.scrollTop;
                        if(oTop > 0){
                            document.documentElement.scrollTop = oTop - move;
                            timer = requestAnimationFrame(fn);
 