本文實例為大家分享了javascript鼠標滑過顯示二級菜單效果，供大家參考，具體內容如下
1. 關鍵代碼：使用 switch 或 if 判斷語句，改變對應的二級菜單顯示方式為 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. 主導航 綁定事件
<ul class="nav">
<li><a href="#" onmouseover="selectTabMenu(71)">首頁</a></li>
3. 二級菜單
<ul id="TabMenuCon71" class="TabMenuCon"> <li><a href="#">公告</a></li> <li><<a href="#">信息</a></li> </ul>
4. 完整代碼
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>水平導航-二級菜單</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 class="navBar">
<ul class="nav">
<li><a href="#" onmouseover="selectTabMenu(71)">首頁</a></li>
<li><a href="#" onmouseover="selectTabMenu(72)">關於協會</a></li>
<li><a href="#" onmouseover="selectTabMenu(73)">協會動態</a></li>
<li><a href="#" onmouseover="selectTabMenu(74)">協會活動</a></li>
<li><a href="#" onmouseover="selectTabMenu(75)">會員</a></li>
<li><a href="#" onmouseover="selectTabMenu(76)">資源空間</a></li>
</ul>
</div>
<div id="TabMenuCon">
<ul id="TabMenuCon71" class="TabMenuCon">
<li><a href="#">公告</a></li>
<li><<a href="#">信息</a></li>
</ul>
<ul id="TabMenuCon72" class="TabMenuCon">
<li>協會簡介</li>
<li>組織機構</li>
<li>協會章程</li>
</ul>
<ul id="TabMenuCon73" class="TabMenuCon">
<li>協會新聞</li>
<li>活動預告</li>
<li>求職招聘</li>
</ul>
<ul id="TabMenuCon74" class="TabMenuCon">
<li>義務維修月</li>
<li>平面設計活動</li>
<li>程序設計活動</li>
<li>戶外拓展</li>
</ul>
<ul id="TabMenuCon75" class="TabMenuCon">
<li>會員登錄</li>
<li>會員注冊</li>
<li>繳納會費</li>
<li>會員信息管理</li>
<li>修改密碼</li>
</ul>
<ul id="TabMenuCon76" class="TabMenuCon">
<li>PS教程</li>
<li>前端設計</li>
<li>Flash教程</li>
</ul>
</div>
</body>
</html>
以上就是本文的全部內容，希望對大家的學習有所幫助。