html+css+JavaScript实现导航栏_js+css菜单栏

作者：繁依Fanyi0 | 2024-02-08 14:09:27

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js+css菜单栏

无下拉菜单的导航栏

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        a {
            text-decoration: none;
            font-size: 14px;
        }
        li {
            list-style: none;
        }
        .nav {
            margin: 100px;
        }
        .nav li {
            float: left;
            width: 80px;
            height: 40px;
            text-align: center;
            line-height: 40px;
        }
        .nav li a {
            display: block;
            width: 100%;
            height: 100%;
            color: #333;
        }
        .nav li a:hover {
            background-color: #eee;
        }
    </style>
</head>
<body>
    <ul class="nav">
        <li>
            <a href="#">登录</a>
        </li>
        <li>
            <a href="#">登录</a>
        </li>
        <li>
            <a href="#">登录</a>
        </li>
    </ul>
</body>
</html>
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有下拉菜单的导航栏

注意子选择器>的使用

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        a {
            text-decoration: none;
            font-size: 14px;
        }
        li {
            list-style: none;
        }
        .nav {
            margin: 100px;
        }
        .nav>li {
            float: left;
            width: 80px;
            height: 40px;
            text-align: center;
            line-height: 40px;
        }
        .nav li a {
            display: block;
            width: 100%;
            height: 100%;
            color: #333;
        }
        .nav>li>a:hover {
            background-color: #eee;
        }
        .nav ul {
            display: none;
            border-left: 1px solid #FECC5B;
            border-right: 1px solid #FECC5B;
        }
        .nav ul li {
            border-bottom: 1px solid #FECC5B;
        }
        .nav ul a:hover {
            background-color: #FFF5DA;
        }
    </style>
</head>
<body>
    <ul class="nav">
        <li>
            <a href="#">登录</a>
            <ul>
                <li><a href="#">评论</a></li>
                <li><a href="#">评论</a></li>
                <li><a href="#">评论</a></li>
                <li><a href="#">评论</a></li>
            </ul>
        </li>
        <li>
            <a href="#">登录</a>
            <ul>
                <li><a href="#">评论</a></li>
                <li><a href="#">评论</a></li>
                <li><a href="#">评论</a></li>
                <li><a href="#">评论</a></li>
            </ul>
        </li>
        <li>
            <a href="#">登录</a>
            <ul>
                <li><a href="#">评论</a></li>
                <li><a href="#">评论</a></li>
                <li><a href="#">评论</a></li>
                <li><a href="#">评论</a></li>
            </ul>
        </li>
    </ul>
    <script>
        var nav = document.querySelector('.nav');
        var lists = nav.children;
        for(var i = 0; i < lists.length; i++) {
            lists[i].onmouseover = function() {
                this.children[1].style.display = 'block';
            }
            lists[i].onmouseout = function() {
                this.children[1].style.display = 'none';
            }
        }
    </script>
</body>
</html>
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