文字向上滚动，鼠标放上去暂停

实例一：无缝滚动，鼠标放上暂停

内容的offsetHeight小于容器的高度时,scrollTop就没有用.

 <div align="center" id="demo" style="overflow:hidden;height:200px;width:600px;border:1px solid #000;">
    <div id="demo1">
       JS实现文字无缝滚动，鼠标放上暂停

     </div>
    <div id="demo2"></div>
</div>
<script language="javascript" type="text/javascript">
<!--
var demo = document.getElementById("demo");
var demo1 = document.getElementById("demo1");
var demo2 = document.getElementById("demo2");
var speed=10;    //滚动速度值，值越大速度越慢
var nnn=200/demo1.offsetHeight;
for(i=0;i<nnn;i++){demo1.innerHTML+="<br />"+ demo1.innerHTML}
demo2.innerHTML = demo1.innerHTML    //克隆demo2为demo1
function Marquee(){
    if(demo2.offsetTop-demo.scrollTop<=0)    //当滚动至demo1与demo2交界时
        demo.scrollTop-=demo1.offsetHeight    //demo跳到最顶端
    else{
        demo.scrollTop++
    }
}
var MyMar = setInterval(Marquee,speed);        //设置定时器
demo.onmouseover = function(){clearInterval(MyMar)}    //鼠标经过时清除定时器达到滚动停止的目的
demo.onmouseout = function(){MyMar = setInterval(Marquee,speed)}    //鼠标移开时重设定时器
-->
</script>

 

实例二：跑马灯 文字一行一行地向上滚动

让项目列表<li>中的文字一行一行地向上滚动:

 <div align="center" id="demo" style="overflow:hidden;height:200px;width:600px;border:1px solid #000;">
    <div id="demo1">
       跑马灯 文字一行一行地向上滚动

    </div>
    <div id="demo2"></div>
</div>
<script language="javascript" type="text/javascript">
<!--
var demo = document.getElementById("demo");
var demo1 = document.getElementById("demo1");
var demo2 = document.getElementById("demo2");
var speed=10;    //滚动速度值，值越大速度越慢
var nnn=200/demo1.offsetHeight;
for(i=0;i<nnn;i++){demo1.innerHTML+="<br />"+ demo1.innerHTML}
demo2.innerHTML = demo1.innerHTML    //克隆demo2为demo1
function Marquee(){
    if(demo2.offsetTop-demo.scrollTop<=0)    //当滚动至demo1与demo2交界时
        demo.scrollTop-=demo1.offsetHeight    //demo跳到最顶端
    else{
        demo.scrollTop++
    }
}
var MyMar = setInterval(Marquee,speed);        //设置定时器
demo.onmouseover = function(){clearInterval(MyMar)}    //鼠标经过时清除定时器达到滚动停止的目的
demo.onmouseout = function(){MyMar = setInterval(Marquee,speed)}    //鼠标移开时重设定时器
-->
</script>