方法一：
<link id="chun" type="text/css" rel="stylesheet" href="css/1.css">
<script Language="JavaScript">
<!-- Begin
var Folder = "css/"; //
var how_many_ads = 4;
var now = new Date();
var sec = now.getSeconds();
var ad = sec % how_many_ads;
var css = "";
ad +=1;
if (ad == 1) {css = "1.css";}
if (ad == 2) {css = "2.css";}
if (ad == 3) {css = "3.css";}
if (ad == 4) {css = "4.css";}
self.chun.href = Folder + css
//-->
</script> |
方法二：
<script language="JavaScript">
var cssurlarr = ["1.css", "2.css", "3.css", "4.css"];
var cssurl = cssurlarr[Math.floor(Math.random()*cssurlarr.length)];
document.write(’<link href="’+cssurl+’" rel="stylesheet" type="text/css">’);
</script |
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