javascript实现下拉菜单的显示与隐藏

时间：2023-03-09 01:27:24
javascript实现下拉菜单的显示与隐藏

demo.html

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>实现下拉菜单效果</title>

    <link rel="stylesheet" type="text/css" href="demo.css">

    <script type="text/javascript" src="demo.js"></script>

</head>

<body>

<div id="nav">

    <ul>

        <li><a href="#">首页</a></li>

        <li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"><a href="#">课程大厅</a>

            <ul>

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

                <li><a href="#">Html/CSS</a></li>

            </ul>

        </li>

        <li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"><a href="#">学习中心</a>

            <ul>

                <li><a href="#">视频学习</a></li>

                <li><a href="#">实例练习</a></li>

                <li><a href="#">问与答</a></li>

            </ul>

        </li>

        <li><a href="#">经典案例</a></li>

        <li><a href="#">关于我们</a></li>

    </ul>

</div>

</body>

</html>

　　demo.js

function displaySubMenu(li) {

    var subMenu = li.getElementsByTagName("ul")[0];

    subMenu.style.display = "block";

}

function hideSubMenu(li) {

    var subMenu = li.getElementsByTagName("ul")[0];

    subMenu.style.display = "none";

}

　　demo.css

*{ margin:0px; padding:0px;}

body{ font-family:Verdana, Geneva, sans-serif; font-size:14px;}

#nav{ width:600px; height:40px; background-color:#eee; margin:0 auto;}

ul{ list-style:none;}

ul li{ float:left; line-height:40px; text-align:center; width:100px;}

a{ text-decoration:none; color:#000; display:block;}

a:hover{ color:#F00; background-color:#666;}

ul li ul li{ float:none;background-color:#eee; margin:2px 0px;}

ul li ul{ display:none;}

　　效果：
javascript实现下拉菜单的显示与隐藏

2017-09-0 6   2017-09-06   

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