js to achieve text scrolling effect_javascript skills

First of all, take a look at the rough rendering. Because it is dynamic, it cannot be displayed on the page.

The specific implementation code is as follows:

1. First is the css code:

<style type="text/css">
body,ul,li,a,p,div{padding:0px; margin:0px; font-size:14px;}
ul,li{list-style:none;}
a{ text-decoration:none; color:#333;}
 #demo{
    overflow:hidden; /*溢出的部分不显示*/
    width:290px;
    height:228px;/*一定要确切，避免demo1与demo2之间的距离过大*/
    padding:5px;
    margin:50px auto;
    }
#express li{
      list-style:none;
      font-size:14px;
      height:25px;
      margin:0px 5px;
      line-height:180%;/*行与行之间的距离*/
      letter-spacing:2px;/*字与字之间的距离*/
      border-bottom:1px dashed #ccc;
      cursor:pointer;
      }
</style>

2. The content code is as follows:

<div id="demo" >
  <div id="demo1" >
    <ul id="express">
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      <li><a href="#">平原街道召开计生业务培训会</a></li>
　　　　　　　<li><a href="#">平原街道：干部进村入户宣传促征迁</a></li>
　　　　　　　<li><a href="#">平原街道：为返乡群众免费孕检</a></li>
      <li><a href="#">平原街道：狠抓春运道路交通安全</a></li>      
    </ul>
  </div>
  <div id="demo2"></div>
</div>

3. The last is the most critical js code:

<script type="text/javascript">
  //获取id=demo,id=demo1,id=demo2的元素对象，并把id=demo1的内容赋值给id=demo2
  var demo=document.getElementById("demo");
  var demo1=document.getElementById("demo1");
  var demo2=document.getElementById("demo2");
  demo2.innerHTML=demo1.innerHTML;
  //给demo1,demo2加相同的高度
  demo1.style.height=demo.offsetHeight+"px";
  demo2.style.height=demo.offsetHeight+"px";
  //定时器，每隔50毫秒调用一次scrollup()函数，来实现文字的滚动
  var timer=window.setInterval("scrollup()",50);
  //定义函数
  function scrollup()
  {
    //如果demo滚上去的高度大于demo的高度，重新给demo赋值从0再开始滑动
    if(demo.scrollTop>=demo.offsetHeight)
    {
      demo.scrollTop=0;
    }else
    {
      demo.scrollTop++;
    }
  }
  //鼠标放上停止滚动，鼠标离开继续滚动
    demo.onmouseover=function(){
                  //清除定时器
                  clearInterval(timer);
                  }
    demo.onmouseout=function(){
                  //添加定时器
                  timer=window.setInterval("scrollup()",50);
                  }

</script>

The above is the entire content of this article. I hope it will be helpful to everyone in learning javascript programming.