javascript 一段左右两边随屏滚动的代码

复制代码 代码如下:

  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

  <html xmlns="http://www.w3.org/1999/xhtml">

  <head>

  <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

  <title>一段左右两边随屏滚动的代码</title>

  </head>

  <body>

  <script language="javascript">

  var delta=0.15

  var collection;

  var closeB=false;

  function floaters(){

  this.items=[];

  this.addItem=function (id,x,y,content)

  {

  document.write('<DIV id='+id+' style="Z-INDEX: 10; POSITION: absolute; width:80px; height:60px;left:'+(typeof (x)=='string'?eval(x):x)+';top:'+(typeof (y)=='string'?eval(y):y)+'">'+content+'</DIV>');

  var newItem={

  };

  newItem.object=document.getElementById(id);

  newItem.x=x;

  newItem.y=y;

  this.items[this.items.length]=newItem;

  }

  this.play=function ()

  {

  collection=this.items

  setInterval('play()',10);

  }

  }

  function play()

  {

  if(screen.width<=648||closeB)

  {

  for(var i=0;i<collection.length;i++)

  {

  collection[i].object.style.display='none';

  }

  return ;

  }

  for(var i=0;i<collection.length;i++)

  {

  var followObj=collection[i].object;

  var followObj_x=(typeof (collection[i].x)=='string'?eval(collection[i].x):collection[i].x);

  var followObj_y=(typeof (collection[i].y)=='string'?eval(collection[i].y):collection[i].y);

  if(followObj.offsetLeft!=(document.documentElement.scrollLeft+followObj_x))

  {

  var dx=(document.documentElement.scrollLeft+followObj_x-followObj.offsetLeft)*delta;

  dx=(dx>0?1:-1)*Math.ceil(Math.abs(dx));

  followObj.style.left=followObj.offsetLeft+dx;

  }

  if(followObj.offsetTop!=(document.documentElement.scrollTop+followObj_y))

  {

  var dy=(document.documentElement.scrollTop+followObj_y-followObj.offsetTop)*delta;

  dy=(dy>0?1:-1)*Math.ceil(Math.abs(dy));

  followObj.style.top=followObj.offsetTop+dy;

  }

  followObj.style.display='';

  }

  }

  function closeBanner()

  {

  closeB=true;

  return ;

  }

  var theFloaters=new floaters();

  //

  theFloaters.addItem('followDiv2',22,238,'<a href=http://idc.66so.com/ target=_blank><img src=http://www.asp300.com/adimg/66so.gif border=0></a><br><br><a href=http://www.red.net.cn target=_blank><img src=http://www.asp300.com/adimg/red.gif border=0></a><br><br><a href=http://www.wiidc.com target=_blank><img src=http://www.asp300.com/adimg/wiidc.gif border=0></a><br><br><img align=right src=http://www.asp300.com/images/ADclose.gif border=0 onClick="closeBanner();">');

  theFloaters.addItem('followDiv1','document.body.clientWidth-100',238,'<a href=http://www.zgdata.com/stat/stat.asp?siteKey=asp300&pageNO=1&urlCode=91a3ed97bd9897d315ff6bfaba46a8ee target=_blank><img src=http://www.asp300.com/adimg/zgdata.gif border=0 height=80 width=80></a><br><br><a href=http://www.go020.net/style/info/host.asp?typeid=1 target=_blank><img src=http://www.asp300.com/adimg/go020.gif border=0></a><br><br><a href=http://www.phsjnet.com target=_blank><img src=http://www.asp300.com/adimg/phsjnet.gif border=0></a><br><br><img align=right src=http://www.asp300.com/images/ADclose.gif border=0 onClick="closeBanner();">');

  theFloaters.play();

  </script>

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  </body>

  </html>

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