这是一款js实现的横向伸展开二级导航菜单，鼠标放在一级菜单的第四个菜单项上，就能展开二级的菜单，菜单没有过多美化，只是一般的修饰，使用的朋友可根据您自己的网站风格重新美化菜单风格。
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=utf-8" /> <title>横向伸展开来的二级导航菜单</title> <style type="text/css"> .suckerdiv { } .suckerdiv ul { width: 120px; position: relative; } .suckerdiv ul li ul { left: 120px; /* Parent menu width - 1*/ position: absolute; width: 140px; /*sub menu width*/ top: 0; display: none; } /*All subsequent sub menu levels offset */ .suckerdiv ul li ul li ul { left: 159px; /* Parent menu width - 1*/ } /* menu links style */ .suckerdiv ul li a { display: block; color: #353302; text-decoration: none; font:12px 宋体; background: #eee; line-height:24px; padding: 0px 10px; border: 1px solid #fff; border-bottom: 0; } .suckerdiv ul li a:visited { color: black; } .suckerdiv ul li a:hover{ color: white; background-color: #97c839; } .suckerdiv .subfolderstyle { } .suckerdiv a.subfolderstyle:hover { background: #97c839 url() no-repeat center right; } </style> </head> <body> <script type="text/javascript"> var menuids = ["suckertree1"] function buildsubmenus() { for (var i = 0; i < menuids.length; i++) { var ultags = document.getElementById(menuids[i]).getElementsByTagName("ul") for (var t = 0; t < ultags.length; t++) { ultags[t].parentNode.getElementsByTagName("a")[0].className = "subfolderstyle" ultags[t].parentNode.onmouseover = function () { this.getElementsByTagName("ul")[0].style.display = "block"; this.firstChild.style.backgroundColor = 'green'; } ultags[t].parentNode.onmouseout = function () { this.getElementsByTagName("ul")[0].style.display = "none" this.firstChild.style.backgroundColor = ''; } } } } if (window.addEventListener) window.addEventListener("load", buildsubmenus, false) else if (window.attachEvent) window.attachEvent("onload", buildsubmenus) </script> <div> <ul> <li><a href="#">腾讯新闻</a></li> <li><a href="#">腾讯汽车</a></li> <li><a href="#">腾讯科技</a></li> <li><a href="#">腾讯手机</a> <ul> <li><a href="#">HTC</a></li> <li><a href="#">联想</a></li> <li><a href="#">华为</a></li> <li><a href="#">中兴</a></li> </ul> </li> </ul> </div> </body> </html>