通过循环计时器给页面滚动条设置动画--套路

var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;

var end = 0;

var change = end - scrollTop;

var t = 0;

var maxT = 30;

var timer = setInterval(function() {

t++;

if(t>=maxT) {

clearInterval(timer);

}

document.body.scrollTop = Tween.Bounce.easeOut(t,scrollTop,change,maxT);

document.documentElement.scrollTop = Tween.Bounce.easeOut(t,scrollTop,change,maxT);

},17)