HTML/CSS方法实现三级菜单

悠悠 2022-01-27 05:15 320阅读 0赞

<!DOCTYPE html>
    <html lang="en">
    
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>三级菜单</title>
        <style>
            a {
                color: #FFFF99;
                text-decoration: none;
            }
    
            a:hover {
                color: #FFFFFF;
                text-decoration: underline;
            }
    
            .top-nav {
                font-size: 16px;
                font-weight: bold;
                list-style: none;
                overflow: auto;
            }
    
            .top-nav li {
                float: left;
            }
    
            /* 二级菜单 */
            .top-nav li ul {
                display: none;
                /* 去圆点 */
                list-style: none;
                padding: 0px;
    
                position: relative;
    
            }
    
            .top-nav li a:hover {
                background-color: red;
            }
    
            .top-nav li:hover ul {
                display: block;
                /* 为了竖向显示 定义一个宽度 */
                width: 80px;
            }
    
            /* 三级菜单 */
            .top-nav li:hover ul li ul {
                display: none;
    
            }
    
            /* 鼠标移动到二级菜单时 三级菜单显示 */
            .top-nav li ul li:hover ul {
                display: block;
                top: 0px;
                left: 80px;
    
                position: absolute;
    
            }
    
            .top-nav li a {
                line-height: 20px;
                text-decoration: none;
                background: #DDDDDD;
                color: #666666;
                display: block;
                width: 80px;
                text-align: center;
            }
        </style>
    </head>
    
    <body>
        <div id="top">
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