<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title><style type="text/css">*{ margin: 0; padding: 0;}a{ text-decoration: none;}#fa{ display: block; width: 100px; height: 30px; line-height: 30px; text-align: center; background: green; color: yellow;}#fa:hover{ background: orange; color: black;}#son{ width: 100px; list-style: none; display: none;}ul a{ display: block; width: 100px; height: 30px; background: #CCC; line-height: 30px; text-align: center; border-bottom: 4px solid red; color: green;}</style><script type="text/javascript">function in(){ var lo=document.getElementById('son'); if (lo.style.display==none) { lo.style.display='block'; } else{ lo.style.display='none'; }}</script></head><body><a id="fa" href="#" onmouseover="in()">我是父目录</a><ul id="son"> <li><a href="#">我是子目录</a></li> <li><a href="#">我是子目录</a></li> <li><a href="#">我是子目录</a></li> </ul> <!-- <input type="button" value="点击取消！" onclick="reset()" /> --></body></html>1、ul未使用定位不知道是否有关；2、js初学，if的用法搞不懂对不对。PS：0基础在家自学，不懂的没人指导，求指点！！！！
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