点击运行
<html> <body> <script type="text/javascript"> image0="/zy/i/eg_banner_w3school.gif" href0="/index.html" alt0="www.qianmu.net" image1="/zy/i/eg_banner_htmlref.gif" href1="http://www.qianmu.net/tags/index.php" alt1="HTML 4.01 / XHTML 1.0 参考手册" image2="/zy/i/eg_banner_jsref.gif" href2="http://www.qianmu.net/js//js/js_reference.php" alt2="JavaScript 参考手册" len=3 now=new Date() now=now.getSeconds() rnd=now%len image=eval("image"+rnd) href=eval("href"+rnd) alt=eval("alt"+rnd) document.write("<a href='" + href + "'>") document.write("<img src='" + image + "' alt='" + alt + "'></a>") </script> <h3>请刷新该页面，您会看到广告条的变化。</h3> </body> </html>
运行结果
