功能非常实用，代码非常简单，就不多废话了，直接奉上：
<!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>仿IE顶部的警告条，可以关闭</title> <style type="text/css"> #informationbar{ position: fixed; left: 0; width: 100%; text-indent: 5px; padding: 5px 0; background-color: lightyellow; border-bottom: 1px solid black; font: bold 12px Verdana; } * html #informationbar{ /*IE6 hack*/ position: absolute; width: expression(document.compatMode=="CSS1Compat"? document.documentElement.clientWidth+"px" : body.clientWidth+"px"); } </style> <script type="text/javascript"> function informationbar(){ this.displayfreq="always" this.content='<a href="javascript:informationbar.close()"><img src="close.gif" /></a>' } informationbar.prototype.setContent=function(data){ this.content=this.content+data document.write('<div id="informationbar">'+this.content+'</div>') } informationbar.prototype.animatetoview=function(){ var barinstance=this if (parseInt(this.barref.style.top)<0){ this.barref.style.top=parseInt(this.barref.style.top)+5+"px" setTimeout(function(){barinstance.animatetoview()}, 50) } else{ if (document.all && !window.XMLHttpRequest) this.barref.style.setExpression("top", 'document.compatMode=="CSS1Compat"? document.documentElement.scrollTop+"px" : body.scrollTop+"px"') else this.barref.style.top=0 } } informationbar.close=function(){ document.getElementById("informationbar").style.display="none" if (this.displayfreq=="session") document.cookie="infobarshown=1;path=/" } informationbar.prototype.setfrequency=function(type){ this.displayfreq=type } informationbar.prototype.initialize=function(){ if (this.displayfreq=="session" && document.cookie.indexOf("infobarshown")==-1 || this.displayfreq=="always"){ this.barref=document.getElementById("informationbar") this.barheight=parseInt(this.barref.offsetHeight) this.barref.style.top=this.barheight*(-1)+"px" this.animatetoview() } } window.onunload=function(){ this.barref=null } </script> <script type="text/javascript"> <> var infobar=new informationbar() infobar.setContent('敬告：明天中午12点天降钱雨，请备好麻袋！ <a href="#">购买麻袋</a><a href="#">购买麻袋</a>') infobar.initialize() </script> </head> <body> </body> </html>
以上所述就是本文的全部内容了，希望大家能够喜欢。