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 none2. 主导航 绑定事件
3. 二级菜单
4. 完整代码
<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;
}
}