变量解释：
speed：滚动的速度；
delay：暂停的时长；
scrollTop ：滚动的高度；
scrollHeight：滚动元素的高度；
1. 无缝垂直滚动（无停歇的一直滚动）
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<link href="css/mui.min.css" rel="stylesheet" />
<style type="text/css">
body{
background-color: #FFFFFF;
}
.out{
overflow: hidden;
height: 21px;
margin-top: 50px;
padding-left: 20px;
}
</style>
</head>
<body>
<div class="out" id="roll">
<div>111111111</div>
<div>222222222</div>
<div>333333333</div>
<div>44444444444</div>
<div>555555555</div>
<div>66666666</div>
<div>777777777777</div>
<div>888888888888</div>
</div>
<script type="text/javascript" src="js/mui.min.js" ></script>
<script type="text/javascript" src="js/jquery-1.8.2.min.js" ></script>
<script type="application/javascript">
var speed = 100;
window.onload = function(){
var area = document.getElementById("roll");
area.innerHTML += area.innerHTML;
function scroll(){
if(area.scrollTop >= area.scrollHeight/2){
area.scrollTop = 0;
}else{
area.scrollTop++;
}
}
setInterval(scroll,speed);
}
</script>
</body>
</html>
2. 间歇性垂直滚动（一次滚动一条）
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<link href="css/mui.min.css" rel="stylesheet" />
<style type="text/css">
body{
background-color: #FFFFFF;
}
.out{
overflow: hidden;
height: 21px;
margin-top: 50px;
padding-left: 20px;
}
</style>
</head>
<body>
<div class="out" id="roll">
<div>111111111</div>
<div>222222222</div>
<div>333333333</div>
<div>44444444444</div>
<div>555555555</div>
<div>66666666</div>
<div>777777777777</div>
<div>888888888888</div>
</div>
<script type="text/javascript" src="js/mui.min.js" ></script>
<script type="text/javascript" src="js/jquery-1.8.2.min.js" ></script>
<script type="application/javascript">
var speed = 100;
var delay = 2000;
var height = 21;
var time;
window.onload = function(){
var area = document.getElementById("roll");
area.innerHTML += area.innerHTML;
function scroll(){
if(area.scrollTop % height == 0){
clearInterval(time);
setTimeout(start,delay);
}else{
area.scrollTop++;
if(area.scrollTop >= area.scrollHeight/2){
area.scrollTop = 0;
}
}
}
function start(){
time = setInterval(scroll,speed);
area.scrollTop++;
}
setTimeout(start,delay);
}
</script>
</body>
</html>
3. 间歇性垂直滚动（一次滚动两条）
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<link href="css/mui.min.css" rel="stylesheet" />
<style type="text/css">
body{
background-color: #FFFFFF;
}
.out{
overflow: hidden;
height: 42px;
margin-top: 50px;
padding-left: 20px;
}
</style>
</head>
<body>
<div class="out" id="roll">
<div>111111111</div>
<div>222222222</div>
<div>333333333</div>
<div>44444444444</div>
<div>555555555</div>
<div>66666666</div>
<div>777777777777</div>
<div>888888888888</div>
</div>
<script type="text/javascript" src="js/mui.min.js" ></script>
<script type="text/javascript" src="js/jquery-1.8.2.min.js" ></script>
<script type="application/javascript">
var speed = 100;
var delay = 2000;
var height = 42;
var time;
window.onload = function(){
var area = document.getElementById("roll");
var counts = $("#roll").find("div").length;
area.innerHTML = area.innerHTML + area.innerHTML + area.innerHTML;
function scroll(){
if(area.scrollTop % height == 0){
clearInterval(time);
setTimeout(start,delay);
}else{
area.scrollTop++;
if(counts % 2 ==0 ){
if(area.scrollTop >= area.scrollHeight/3){
area.scrollTop = 0;
}
}else{
if(area.scrollTop >= area.scrollHeight*2/3){
area.scrollTop = 0;
}
}
}
}
function start(){
time = setInterval(scroll,speed);
area.scrollTop++;
}
setTimeout(start,delay);
}
</script>
</body>
</html>
原理：
取出要显示文字的部分（这里暂且称其为a部分），复制一份a部分本身连接在a部分后面，形成重复一次的效果（这里暂且称之为aa部分）；随着aa部分渐渐向上滚动，当aa部分滚动的高度与原本a部分的高度一样的时候，将aa部分迅速挪到最初始的位置，即可实现循环滚动的效果；
想要显示多条数据，只需要改动out样式的“height: 42px”部分即可；
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版权声明：本文为CSDN博主「fairydeng」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/fairydeng/article/details/83274262