请问javascript如何控制div的位置？

function doScroll(){
document.all.div_id.style.top = document.body.clientHeight-document.all.div_id.style.pixelHeight+document.body.scrollTop;
}<body onscroll="doScroll();">

解决方案 »

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这个不用javascript的，直接用CSS属性 position:fixed; 就可以了
不对啊，这个一scroll就滚到页面最底端了
正在研究自己的版本啊！！下边是我在网上找的一个
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<script language=javascript>
function picsize(obj,MaxWidth){
img=new Image();//新建一个Image对象，用这个对象的width就不会出现width为0的现象
  img.src=obj.src;
  if (img.width>MaxWidth)
  {
  return MaxWidth;
  }
  else
  {
  return img.width;
  }
  }
</script>
<link href="style.css" rel="stylesheet" type="text/css" />

</head>
<body>
<SCRIPT>
  var online= new Array();
  if (!document.layers)
  document.write('<div id="divStayTopLeft" style="position:absolute">')
</SCRIPT>
<layer id="divStayTopLeft">
<table border="0" width="110" cellspacing="0" cellpadding="0">
<tr><td width="110"><img border=0 src=026_kefu_up.gif></td></tr>
<script src="http://webpresence.qq.com/getonline?Type=1&32906835:262123986:"></script>

<tr><td valign=middle background=026_kefu_middle.gif>
<script>
  if (online[0]==0)
  document.write(" <img src=026_QQoffline.gif border=0 align=middle><a class='qqb' target=blank href='http://wpa.qq.com/msgrd?V=1&Uin=32906835&Site=在线咨询&Menu=no' title='客服不在线，请留言'>32906835</a>");
  else
  document.write(" <img src=026_QQonline.gif border=0 align=middle><a class='qqa' target=blank href='http://wpa.qq.com/msgrd?V=1&Uin=32906835&Site=在线咨询&Menu=no' title='在线即时交谈'>32906835</a>");
</script >
</td></tr><tr><td valign=middle background=026_kefu_middle.gif>
<script>
  if (online[1]==0)
  document.write(" <img src=026_QQoffline.gif border=0 align=middle><a class='qqb' target=blank href='http://wpa.qq.com/msgrd?V=1&Uin=262123986&Site=在线咨询&Menu=no' title='客服不在线，请留言'>262123986</a>");
  else
  document.write(" <img src=026_QQonline.gif border=0 align=middle><a class='qqa' target=blank href='http://wpa.qq.com/msgrd?V=1&Uin=262123986Site=在线咨询&Menu=no' title='在线即时交谈'>262123986</a>");
</script >
</td></tr>
<tr><td width="110"><img border=0 src=026_kefu_down.gif></td></tr>
</table>
<script type="text/javascript">
  //Enter "frombottom" or "fromtop"
  var verticalpos="frombottom"
  if (!document.layers)
  document.write('</div>')
  function JSFX_FloatTopDiv()
  {
  var startX =6,
  startY = 150;
  var ns = (navigator.appName.indexOf("Netscape") != -1);
  var d = document;
  function ml(id)
  {
  var el=d.getElementById?d.getElementById(id):d.all?d.all[id]:d.layers[id];
  if(d.layers)el.style=el;
  el.sP=function(x,y){this.style.left=x;this.style.top=y;};
  el.x = startX;
  if (verticalpos=="fromtop")
  el.y = startY;
  else{
  el.y = ns ? pageYOffset + innerHeight : document.body.scrollTop + document.body.clientHeight;
  el.y -= startY;
  }
  return el;
  }
  window.stayTopLeft=function()
  {
  if (verticalpos=="fromtop"){
  var pY = ns ? pageYOffset : document.body.scrollTop;
  ftlObj.y += (pY + startY - ftlObj.y)/8;
  }
  else{
  var pY = ns ? pageYOffset + innerHeight : document.body.scrollTop + document.body.clientHeight;
  ftlObj.y += (pY - startY - ftlObj.y)/8;
  }
  ftlObj.sP(ftlObj.x, ftlObj.y);
  setTimeout("stayTopLeft()", 10);
  }
  ftlObj = ml("divStayTopLeft");
  stayTopLeft();
  }
  JSFX_FloatTopDiv();
</script>