js文字滚动（上下左右）

注：上下滚动时，单元格demo1里面的内容高度要大于demo设置的高度才能无限滚动
       左右滚动时，单元格demo1里面的内容宽度要大于demo设置的宽度才能无限滚动

一、上下滚动

1.显示的内容
<div id="demo" style="OVERFLOW: hidden; WIDTH: 200px; HEIGHT: 100px; ">
<table border="0" cellpadding="0" cellspacing="0">
<tr>
   <td id="demo1"><table width="100%" height="99" border="0" cellpadding="0" cellspacing="0">
          <tr>
            <td>一</td>
          </tr>
          <tr>
            <td>二</td>
          </tr>
          <tr>
            <td>三</td>
          </tr>
        </table></td>
</tr>
<tr>
   <td id="demo2"></td>
</tr>
</table>
</div>

2.向上滚动JS

<SCRIPT>
var speed=30
var MyMarh=setInterval(Marqueeh,speed)
demo2.innerHTML=demo1.innerHTML
//原理是不断的向demoh2中填入demoh1中的内容，然后将已经看不见的清除
//用一个两行一列的表格，上一列再放一个装填有内容的表格，定义为demoh1，下一列是空的TD，定义为demoh2
//SPEED是用来控制速度的。
demo. clearInterval(MyMarh) }
demo. MyMarh=setInterval(Marqueeh,speed) }
function Marqueeh(){
if(demo2.offsetHeight-demo.scrollTop<=0)
   demo.scrollTop-=demo1.offsetHeight
else{
   demo.scrollTop++
}
}
</SCRIPT>

3.向下滚动JS

<script>
var speed=30
demo2.innerHTML=demo1.innerHTML
demo.scrollTop=demo.scrollHeight
var MyMar=setInterval(Marquee,speed)

demo. {clearInterval(MyMar)}
demo. {MyMar=setInterval(Marquee,speed)}
function Marquee(){
if(demo1.offsetTop-demo.scrollTop>=0)
   demo.scrollTop+=demo2.offsetHeight
else{
   demo.scrollTop--
}
}
</script>

二、左右滚动

1.显示内容

<div id="demo" style="overflow:hidden;width:200px;">
<table cellpadding="0" cellspace="0" border="0">
<tr>
<td id="demo1"><table width="200" border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td>一</td>
      <td>二</td>
      <td>三</td>
    </tr>
</table></td>
<td id="demo2"></td>
</tr>
</table>
</div>

2.向左滚动JS

<script>
var speed=30
var MyMar=setInterval(Marquee,speed)
demo2.innerHTML=demo1.innerHTML
demo. {clearInterval(MyMar)}
demo. {MyMar=setInterval(Marquee,speed)}
function Marquee(){
if(demo2.offsetWidth-demo.scrollLeft<=0)
   demo.scrollLeft-=demo1.offsetWidth
else{
   demo.scrollLeft++
}
}
</script>

3.向右滚动JS

<script>
var speed=30
var MyMar=setInterval(Marquee,speed)
demo2.innerHTML=demo1.innerHTML
demo. {clearInterval(MyMar)}
demo. {MyMar=setInterval(Marquee,speed)}
function Marquee(){
if(demo.scrollLeft<=0)
   demo.scrollLeft+=demo2.offsetWidth
else{
   demo.scrollLeft--
}
}
</script>