采用CSS和JS,刚好我最近有个站点要用到下拉菜单!_JavaScript

startList = function() {
if (document.all&&document.getElementById) {
navRoot = document.getElementById("nav");
for (i=0; inode = 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;

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 */
-->

 
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