<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>
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本文标题:用js实现控制内容的向上向下滚动效果
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