分享程序员开发的那些事...
更新时间：2022-09-14 12:20:03
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<!DOCTYPE HTML><html lang="en-US">
<head>
<meta charset="UTF-8">
<title>无缝滚动——上下</title>
<style type="text/css">
*{margin:0;padding:0;}
li{list-style:none;}
img{border:0;}
#scroll{width:178px;margin:50px auto;position:relative;}
.btn{display:block;width:27px;height:27px;margin-left:auto;margin-right:auto;cursor:pointer;}
.up{background:url(images/up.gif);border:solid 1px red;}
.down{background:url(images/down.gif);}
.content{margin:10px 0;height:240px;overflow:hidden;position:relative;border:solid 1px balck;}
.content ul{position:absolute;top:0;left:0;}
.content li{height:30px;}
</style>
</head>
<body>
<div id="scroll">
<div class="content">
<ul>
<li>1</li>
<li>1</li>
<li>1</li>
<li>1</li>
<li>1</li>
<li>1</li>
<li>1</li>
<li>1</li>
</ul>
</div>
</div>
</body>
</html>
<script type="text/javascript">
window.onload = function(){ var oDiv = document.getElementById('scroll');
var btnUp = document.getElementById('up');
var btnDown = document.getElementById('down');
var oUl = oDiv.getElementsByTagName('ul')[0];
var timer = null;
var speed = -1;
oUl.innerHTML += oUl.innerHTML;
setTimeout(move,1500);
btnUp.onclick = function(){
clearInterval(timer);
speed = -1;
move();
};
btnDown.onclick = function(){
clearInterval(timer);
speed = 1;
move();
};
oUl.onmouseover = function(){
clearInterval(timer);
};
oUl.onmouseout = function(){
move();
};
function move(){
timer = setInterval(function(){
oUl.style.top = oUl.offsetTop + speed + 'px';
if(oUl.offsetTop <= - oUl.offsetHeight / 2){
oUl.style.top = '0';
}else if(oUl.offsetTop >= 0){
oUl.style.top = - oUl.offsetHeight / 2 + 'px';
};
},30);
};
};</script>
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