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网页滚动置顶代码
作者:西安网站建设  来源:www.xacx.net  发表时间:2013-6-4 12:09:15  点击:6385
<style type="text/css">

#topbar{
position:absolute;
border: 1px solid black;
padding: 2px;
background-color: lightyellow;
width: 620px;
visibility: hidden;
z-index: 100;
}

</style>

<script type="text/javascript">

var persistclose=0 //set to 0 or 1. 1 means once the bar is manually closed, it will remain closed for browser session
var startX = 30 //set x offset of bar in pixels
var startY = 3 //set y offset of bar in pixels

function iecompattest(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function get_cookie(Name) {
var search = Name + "="
var returnvalue = "";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search)
if (offset != -1) {
offset += search.length
end = document.cookie.indexOf(";", offset);
if (end == -1) end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset, end))
}
}
return returnvalue;
}

var verticalpos="fromtop"

function closebar(){
if (persistclose)
document.cookie="remainclosed=1"
document.getElementById("topbar").style.visibility="hidden"
}

function staticbar(){

 var ns = (navigator.appName.indexOf("Netscape") != -1);
 var d = document;
 function ml(id){
  var el=d.getElementById(id);
  if (!persistclose || persistclose && get_cookie("remainclosed")=="")
  el.style.visibility="visible"
  if(d.layers)el.style=el;
  el.sP=function(x,y){this.style.left=x+"px";this.style.top=y+"px";};
  el.x = startX;
  if (verticalpos=="fromtop")
  el.y = startY;
  else{
  el.y = ns ? pageYOffset + innerHeight : iecompattest().scrollTop + iecompattest().clientHeight;
  el.y -= startY;
  }
  return el;
 }
 window.stayTopLeft=function(){
  if (verticalpos=="fromtop"){
  var pY = ns ? pageYOffset : iecompattest().scrollTop;
  ftlObj.y += (pY + startY - ftlObj.y)/8;
  }
  else{
  var pY = ns ? pageYOffset + innerHeight : iecompattest().scrollTop + iecompattest().clientHeight;
  ftlObj.y += (pY - startY - ftlObj.y)/8;
  }
  ftlObj.sP(ftlObj.x, ftlObj.y);
  setTimeout("stayTopLeft()", 10);
 }
 ftlObj = ml("topbar");
 stayTopLeft();
}

if (window.addEventListener)
window.addEventListener("load", staticbar, false)
else if (window.attachEvent)
window.attachEvent("onload", staticbar)
else if (document.getElementById)
window.onload=staticbar
</script>
<div id="topbar">
<a href="" onClick="closebar(); return false"><img src="s.gif" border="0" /></a>
这里显示内容
</div>
<table style="height:1200"> </table>

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