用js实现控制内容的向上向下滚动效果

【 tulaoshi.com - Web开发 】

SCRIPT language=JavaScript1.2
iens6=document.all||document.getElementById
ns4=document.layers

//specify speed of scroll (greater=faster)
var speed=10

if (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
if (iens6)
document.write('/div/div')
/SCRIPT
SCRIPT language=JavaScript1.2
if (iens6){
var crossobj=document.getElementById? document.getElementById("content") : document.all.content
var contentheight=crossobj.offsetHeight
}
else if (ns4){
var crossobj=document.nscontainer.document.nscontent
var contentheight=crossobj.clip.height
}

function movedown(){
if (iens6&&parseInt(crossobj.style.top)=(contentheight*(-1)+100))
crossobj.style.top=parseInt(crossobj.style.top)-speed
else if (ns4&&crossobj.top=(contentheight*(-1)+100))
crossobj.top-=speed
movedownvar=setTimeout("movedown()",100)
}

function moveup(){
if (iens6&&parseInt(crossobj.style.top)=0)
crossobj.style.top=parseInt(crossobj.style.top)+speed
else if (ns4&&crossobj.top=0)
crossobj.top+=speed
moveupvar=setTimeout("moveup()",100)

}

function getcontent_height(){
if (iens6)
contentheight=crossobj.offsetHeight
else if (ns4)
document.nscontainer.document.nscontent.visibility="show"
}
window.onload=getcontent_height
/SCRIPT