HTML 随机加载CSS文件

   <script language="JavaScript" type="text/javascript"> 
    var cssurlarr = ["../css/yellow.css", "../css/blue.css", "../css/green.css"]; 
var cssurl = cssurlarr[Math.floor(Math.random()*cssurlarr.length)]; 
document.write('<link href="'+cssurl+'" rel="stylesheet" type="text/css">');
    </script>