采用CSS和JS的下拉菜單的制作

　　<script language="javascript"> // JavaScript Document startList = function() { if (document.all&&document.getElementById) { navRoot = document.getElementById("nav"); for (i=0; i<navRoot.childNodes.length; i++) { node = navRoot.childNodes[i]; if (node.nodeName=="LI") { node.onmouseover=function() { this.className+=" over"; } node.onmouseout=function() { this.className=this.className.replace(" over", ""); } } } } } window.onload=startList; </script> <style type="text/css"> <!-- body { font: normal 11px verdana; } ul { margin: 0; padding: 0; list-style: none; width: 150px; /* Width of Menu Items */ border-bottom: 1px solid #ccc; } ul li { position: relative; } li ul { position: absolute; left: 149px; /* Set 1px less than menu width */ top: 0; display: none; } /* Styles for Menu Items */ ul li a { display: block; text-decoration: none; color: #777; background: #fff; /* IE6 Bug */ padding: 5px; border: 1px solid #ccc; /* IE6 Bug */ border-bottom: 0; } /* Holly Hack. IE Requirement */ * html ul li { float: left; height: 1%; } * html ul li a { height: 1%; } /* End */ li:hover ul, li.over ul { display: block; } /* The magic */ --> </style> <ul id="nav"> <li><a #">Home</a></li> <li><a #">About</a> <ul> <li><a #">History</a></li> <li><a #">Team</a></li> <li><a #">Offices</a></li> </ul> </li> <li><a #">Services</a> <ul> <li><a #">Web Design</a></li> <li><a #">Internet Marketing</a></li> <li><a #">Hosting</a></li> <li><a #">Domain Names</a></li> <li><a #">Broadband</a></li> </ul> </li> <li><a #">Contact Us</a> <ul> <li><a #">United Kingdom</a></li> <li><a #">France</a></li> <li><a #">USA</a></li> <li><a #">Australia</a></li> </ul> </li> </ul>
        
From:http://tw.wingwit.com/Article/program/Java/Javascript/201311/25433.html