运行效果截图如下：
在线演示地址如下：
具体代码如下：
<!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>导航菜单</title> </head> <body> <SCRIPT LANGUAGE="JavaScript"> <!-- Begin site = "http://www.qq.com"; // Do not include the final "https://www.jb51.net/" function combineMenus(frm, menu1, menu2) { with (frm) { str = menu1.options[menu1.selectedIndex].value; str += menu2.options[menu2.selectedIndex].value; url = site + "https://www.jb51.net/" + str + ".htm"; window.location.href = url; } } // End --> </script> <form name=menufrm> <select name=menu1> <option value="">时间类</option> <option value="time">time</option> </select> <select name=menu2> <option value="">哪个</option> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> </select> <input type=button value="Select"> </form> <SCRIPT LANGUAGE="JavaScript"> function makeArray(q){ for(i=1 ; i < q ; i++){this[i]=0}} w=1; howmanysites=4; // How many sites are listed below? Sites = new makeArray(howmanysites); Sites[1] = "https://www.jb51.net.com~JavaScript Planet|Hundreds of JavaScripts!"; Sites[2] = "http://www.baidu.com/dhtml~dHTML Scripts|Free dHTML Scripts!"; Sites[3] = "http://www.163.com~Altavista|The best search engine"; Sites[4] = "http://www.qq.com~Dynamic Drive|More dHTML Scripts"; function showSites() { if (w > howmanysites) { w=1; }; var string=Sites[w] + ""; var split1=string.indexOf("~"); var split2=string.indexOf("|"); var url=string.substring(0,split1); var name=string.substring(split1 + 1,split2); var word=string.substring(split2 + 1,string.length); document.form.url.value=url; document.form.name.value=name; document.form.word.value=word; w+=1; window.setTimeout('showSites()',3000); } function visitSite() { window.location=document.form.url.value; } </SCRIPT> <form name=form> <table><tr><td align=center> <input type=button name=name value="Visit" size=25> <input type=hidden name=url value=""> <input type=text name=word value="" size=40> </td></tr></table> </form> </center> <script> showSites(); </script> </body> </html>