本文实例为大家分享了javascript鼠标滑过显示二级菜单效果，供大家参考，具体内容如下
1. 关键代码：使用 switch 或 if 判断语句，改变对应的二级菜单显示方式为 block 或 none
function selectTabMenu(i){ switch(i){ case 71: document.getElementById("TabMenuCon71").style.display="block"; document.getElementById("TabMenuCon72").style.display="none"; document.getElementById("TabMenuCon73").style.display="none"; document.getElementById("TabMenuCon74").style.display="none"; document.getElementById("TabMenuCon75").style.display="none"; document.getElementById("TabMenuCon76").style.display="none"; break; ... }}2. 主导航 绑定事件
<ul>
<li><a href="#" onmouseover="selectTabMenu(71)">首页</a></li>
3. 二级菜单
<ul id="TabMenuCon71"> <li><a href="#">公告</a></li> <li><<a href="#">信息</a></li></ul>
4. 完整代码
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>水平导航-二级菜单</title> <style type="text/css"> *{ padding:0px; margin: 0px; } .navBar{ height: 30px; background-color: #2B383E; text-align: center; } ul{ list-style: none; } .nav li{ float: left; } .nav li a{ display: block; padding: 0 20px; height: 30px; line-height: 30px; text-decoration: none; color: #fff; } .nav li a:hover{ background-color: #fff; color: #4DB6E7 } .TabMenuCon{ clear: both; display: none; } .TabMenuCon li{ display: inline-block; } </style> <script type="text/javascript"> function selectTabMenu(i){ switch(i){ case 71: document.getElementById("TabMenuCon71").style.display="block"; document.getElementById("TabMenuCon72").style.display="none"; document.getElementById("TabMenuCon73").style.display="none"; document.getElementById("TabMenuCon74").style.display="none"; document.getElementById("TabMenuCon75").style.display="none"; document.getElementById("TabMenuCon76").style.display="none"; break; case 72: document.getElementById("TabMenuCon71").style.display="none"; document.getElementById("TabMenuCon72").style.display="block"; document.getElementById("TabMenuCon73").style.display="none"; document.getElementById("TabMenuCon74").style.display="none"; document.getElementById("TabMenuCon75").style.display="none"; document.getElementById("TabMenuCon76").style.display="none"; break; case 73: document.getElementById("TabMenuCon71").style.display="none"; document.getElementById("TabMenuCon72").style.display="none"; document.getElementById("TabMenuCon73").style.display="block"; document.getElementById("TabMenuCon74").style.display="none"; document.getElementById("TabMenuCon75").style.display="none"; document.getElementById("TabMenuCon76").style.display="none"; break; case 74: document.getElementById("TabMenuCon71").style.display="none"; document.getElementById("TabMenuCon72").style.display="none"; document.getElementById("TabMenuCon73").style.display="none"; document.getElementById("TabMenuCon74").style.display="block"; document.getElementById("TabMenuCon75").style.display="none"; document.getElementById("TabMenuCon76").style.display="none"; break; case 75: document.getElementById("TabMenuCon71").style.display="none"; document.getElementById("TabMenuCon72").style.display="none"; document.getElementById("TabMenuCon73").style.display="none"; document.getElementById("TabMenuCon74").style.display="none"; document.getElementById("TabMenuCon75").style.display="block"; document.getElementById("TabMenuCon76").style.display="none"; break; case 76: document.getElementById("TabMenuCon71").style.display="none"; document.getElementById("TabMenuCon72").style.display="none"; document.getElementById("TabMenuCon73").style.display="none"; document.getElementById("TabMenuCon74").style.display="none"; document.getElementById("TabMenuCon75").style.display="none"; document.getElementById("TabMenuCon76").style.display="block"; break; } } </script></head><body> <div> <ul> <li><a href="#" onmouseover="selectTabMenu(71)">首页</a></li> <li><a href="#" onmouseover="selectTabMenu(72)">关于协会</a></li> <li><a href="#" onmouseover="selectTabMenu(73)">协会动态</a></li> <li><a href="#" onmouseover="selectTabMenu(74)">协会活动</a></li> <li><a href="#" onmouseover="selectTabMenu(75)">会员</a></li> <li><a href="#" onmouseover="selectTabMenu(76)">资源空间</a></li> </ul> </div> <div id="TabMenuCon"> <ul id="TabMenuCon71"> <li><a href="#">公告</a></li> <li><<a href="#">信息</a></li> </ul> <ul id="TabMenuCon72"> <li>协会简介</li> <li>组织机构</li> <li>协会章程</li> </ul> <ul id="TabMenuCon73"> <li>协会新闻</li> <li>活动预告</li> <li>求职招聘</li> </ul> <ul id="TabMenuCon74"> <li>义务维修月</li> <li>平面设计活动</li> <li>程序设计活动</li> <li>户外拓展</li> </ul> <ul id="TabMenuCon75"> <li>会员登录</li> <li>会员注册</li> <li>缴纳会费</li> <li>会员信息管理</li> <li>修改密码</li> </ul> <ul id="TabMenuCon76"> <li>PS教程</li> <li>前端设计</li> <li>Flash教程</li> </ul> </div></body></html>以上就是本文的全部内容，希望对大家的学习有所帮助。