js向上滚动:用js实现控制内容的向上向下滚动效果

<SCRIPT language=JavaScript1.2>
iens6=document.all||document.getElementById
ns4=document.layers
//specy speed of scroll (greater=faster)
var speed=10
(iens6){
document.write('<div id="container" style="position:relative;width:600;height:430;border:0px solid black;overflow:hidden">')
document.write('<div id="content" style="position:absolute;width:590;left:0;top:0">')
}
</SCRIPT>
<SCRIPT language=JavaScript1.2>
(iens6)
document.write('</div></div>')
</SCRIPT>
<SCRIPT language=JavaScript1.2>
(iens6){
var crossobj=document.getElementById? document.getElementById("content") : document.all.content
var contentheight=crossobj.offHeight
}
(ns4){
var crossobj=document.nscontainer.document.nscontent
var contentheight=crossobj.clip.height
}
function movedown{
(iens6&&parseInt(crossobj.style.top)>=(contentheight*(-1)+100))
crossobj.style.top=parseInt(crossobj.style.top)-speed
(ns4&&crossobj.top>=(contentheight*(-1)+100))
crossobj.top-=speed
movedownvar=Timeout("movedown",100)
}
function moveup{
(iens6&&parseInt(crossobj.style.top)<=0)
crossobj.style.top=parseInt(crossobj.style.top)+speed
(ns4&&crossobj.top<=0)
crossobj.topspeed
moveupvar=Timeout("moveup",100)
}
function getcontent_height{
(iens6)
contentheight=crossobj.offHeight
(ns4)
document.nscontainer.document.nscontent.visibility="show"
}
window.onload=getcontent_height
</SCRIPT>

延伸阅读

• 2008-9-24-- 向上向下:C++中的向上类型转换和向下类型转换