<rt id="u2gi4"></rt> 
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var oDiv = document.getElementById('demo');
var oUl = document.getElementById('demo1');
var aLi = oUl.getElementsByTagName('li');
var speed = -1;
var timer = null;
oUl.offsetTop = aLi[1].offsetTop + 'px';
timer = setInterval(function(){
oUl.style.top = oUl.offsetTop + speed + 'px';
if(oUl.offsetTop < -384){
oUl.style.top = '-192px';
$("#demo1 li").last().after($("#demo1 li").first())
}else if(oUl.offsetTop > 0){
oUl.style.top = - oUl.offsetHeight / 5 + 'px';
}
},30);
oUl.onmouseover = function(){
clearInterval(timer);
};
oUl.onmouseout = function(){
timer = setInterval(function(){
oUl.style.top = oUl.offsetTop + speed + 'px';
if(oUl.offsetTop < -384){
oUl.style.top = '-192px';
$("#demo1 li").last().after($("#demo1 li").first())
}else if(oUl.offsetTop > 0){
oUl.style.top = - oUl.offsetHeight / 5 + 'px';
}
},30);
};
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<rt id="u2gi4"></rt>