前端:实现二级菜单（二级菜单悬浮在一级菜单左侧）

效果

代码

<!DOCTYPE html>
<html lang="en">

    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>左侧二级菜单实现</title>
        <style>
        * {
            margin: 0;
            padding: 0;
        }

        /* 取消所有列表的序号 */
        ul,
        li {
            list-style-type: none;
        }

        /* 取消所有超链接的下划线 */
        a {
            text-decoration-line: none;
            color: white;
        }

        /* 全部样式 */
        .all_content {
            display: flex;
        }

        /* 左侧导航栏 */
        .left_nav {
            background-color: rgb(83, 151, 230);
            width: 5%;
            height: 100vh;
        }
        .left_nav p{
            width: 100%;
            text-align: center;
            font-size:120%;
            color: white;
            font-weight: bold;
            margin:10px 0;
        }
        /* 外层li */
        .menu-item {
            text-align: center;
            padding: 10px 0;
            background-color: rgb(83, 151, 230);
            position: relative;
        }
        .submenu {
            position: absolute;
            left: 100%;
            top: 50%;
            transform: translateY(-50%);
            display: none;
            background-color: rgb(120, 170, 228);
            white-space: nowrap;
        }
        .submenu:before {
            content: "";
            position: absolute;
            left: -10px;
            top: 50%;
            transform: translate(-50%, -50%) rotate(45deg);
            width: 10px;
            height: 10px;
            background-color: rgb(120, 170, 228);
        }
        .submenu-li {
            background-color: rgb(120, 170, 228);
            width: 100%;
            padding: 5px 10px;
        }

        .submenu-link:hover {
            font-weight: 600;
        }

        .menu-item:hover .submenu {
            display: block;
        }

        /* 右侧内容 */
        .right_content {
            width: 95%;
        }

        .content {
            display: none;
            /* 隐藏所有内容 */
        }

        .content.active {
            display: block;
            /* 显示被激活的内容 */
        }
    </style>
    </head>

    <body>
        <div class="all_content">
            <div class="left_nav">
                <p>菜单</p>
                <ul class="menu">
                    <li class="menu-item">
                        <a href="#" class="menu-link">销售</a>
                        <ul class="submenu">
                            <li class="submenu-li"><a href="#"
                                    class="submenu-link"
                                    data-content-id="content1">功能1</a></li>
                            <li class="submenu-li"><a href="#"
                                    class="submenu-link"
                                    data-content-id="content2">报表1</a></li>
                        </ul>
                    </li>
                    <li class="menu-item">
                        <a href="#" class="menu-link">采购</a>
                        <ul class="submenu">
                            <li class="submenu-li"><a href="#"
                                    class="submenu-link"
                                    data-content-id="content3">功能2</a></li>
                            <li class="submenu-li"><a href="#"
                                    class="submenu-link"
                                    data-content-id="content4">报表2</a></li>
                        </ul>
                    </li>
                </ul>
            </div>
            <div class="right_content">
                <div id="content1" class="content">功能1的内容</div>
                <div id="content2" class="content">报表1的内容</div>
                <div id="content3" class="content">功能2的内容</div>
                <div id="content4" class="content">报表2的内容</div>
            </div>
        </div>
        <script>
        // 获取所有一级菜单项
        var menuItems = document.querySelectorAll('.menu-item');
        // 为每个一级菜单项添加点击事件处理程序
        menuItems.forEach(function (menuItem) {
            var submenuLinks = menuItem.querySelectorAll('.submenu-link');
            var contents = document.querySelectorAll('.content');
            // 二级菜单项点击事件处理程序
            submenuLinks.forEach(function (submenuLink) {
                submenuLink.addEventListener('click', function (e) {
                    e.preventDefault();

                    // 隐藏所有内容
                    contents.forEach(function (content) {
                        content.classList.remove('active');
                    });

                    // 获取被点击项对应的内容ID
                    var contentId = submenuLink.getAttribute('data-content-id');

                    // 添加激活状态到对应的内容
                    var activeContent = document.getElementById(contentId);
                    activeContent.classList.add('active');
                });
            });
        });
    </script>
    </body>

</html>
前端:实现二级菜单（二级菜单悬浮在一级菜单左侧）

效果

代码

猜你喜欢
