javascript 特效实现(3)—— 鼠标滑过显示二级菜单效果

2023-01-09 21:10:21

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 class="nav">

　　<li><a href="#" onmouseover="selectTabMenu(71)">首页</a></li>

3. 二级菜单

<ul id="TabMenuCon71" class="TabMenuCon">

　　<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 class="navBar">

        <ul class="nav">

            <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" class="TabMenuCon">

            <li><a href="#">公告</a></li>

            <li><<a href="#">信息</a></li>

        </ul>

        <ul id="TabMenuCon72" class="TabMenuCon">

            <li>协会简介</li>

            <li>组织机构</li>

            <li>协会章程</li>

        </ul>

        <ul id="TabMenuCon73" class="TabMenuCon">

            <li>协会新闻</li>

            <li>活动预告</li>

            <li>求职招聘</li>

        </ul>

        <ul id="TabMenuCon74" class="TabMenuCon">

            <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" class="TabMenuCon">

            <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" class="TabMenuCon">

            <li>PS教程</li>

            <li>前端设计</li>

            <li>Flash教程</li>

        </ul>

    </div>

</body>

</html>

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