W3School TIY
编辑您的代码：
<html> <body> <script type="text/javascript"> image0="../i/eg_banner_w3school.gif"/*tpa=http://www.jb51.net/i/eg_banner_w3school.gif*/ href0="../index.html"/*tpa=http://www.jb51.net/index.html*/ alt0="jb51.net.htm"/*tpa=http://www.jb51.net/tiy/jb51.net*/ image1="../i/eg_banner_htmlref.gif"/*tpa=http://www.jb51.net/i/eg_banner_htmlref.gif*/ href1="../tags/index.htm"/*tpa=http://www.jb51.net/tags/index.asp*/ alt1="HTML 4.01 / XHTML 1.0 参考手册" image2="../i/eg_banner_jsref.gif"/*tpa=http://www.jb51.net/i/eg_banner_jsref.gif*/ href2="../js/js/js_reference.htm"/*tpa=http://www.jb51.net/js//js/js_reference.asp*/ 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>
查看结果: