js （单个的）点击式下拉菜单

<!DOCTYPE html>

<html>

<head lang="en">

    <meta charset="UTF-8">

    <title></title>

    <style>

        .container {

            overflow: hidden;

            background-color: #333;

            font-family: Arial;

        }

        .container a {

            float: left;

            font-size: 16px;

            color: white;

            text-align: center;

            padding: 14px 16px;

            text-decoration: none;

        }

        .dropdown {

            float: left;

            overflow: hidden;

        }

        .dropdown .dropbtn {

            cursor: pointer;

            font-size: 16px;

            border: none;

            outline: none;

            color: white;

            padding: 14px 16px;

            background-color: inherit;

        }

        .container a:hover, .dropdown:hover .dropbtn {

            background-color: red;

        }

        .dropdown-content {

            display: none;

            position: absolute;

            background-color: #f9f9f9;

            min-width: 160px;

            box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);

            z-index: 1;

        }

        .dropdown-content a {

            float: none;

            color: black;

            padding: 12px 16px;

            text-decoration: none;

            display: block;

            text-align: left;

        }

        .dropdown-content a:hover {

            background-color: #ddd;

        }

        .show {

            display: block;

        }

    </style>

</head>

<body>

<div class="container">

    <a href="#home">主页</a>

    <a href="#news">新闻</a>

    <div class="dropdown">

        <button class="dropbtn" onclick="myFunction()">下拉菜单</button>

        <div class="dropdown-content" id="myDropdown">

            <a href="#">Link 1</a>

            <a href="#">Link 2</a>

            <a href="#">Link 3</a>

        </div>

    </div>

</div>

<h3>导航栏中的下拉菜单</h3>

<p>点击按钮显示下拉菜单</p>

</body>

</html>

<script>

    /* 点击按钮，下拉菜单在 显示/隐藏 之间切换 */

    function myFunction() {

        document.getElementById("myDropdown").classList.toggle("show");

    }

    // 点击下拉菜单意外区域隐藏

    window.onclick = function(e) {

        if (!e.target.matches('.dropbtn')) {

            var myDropdown = document.getElementById("myDropdown");

            if (myDropdown.classList.contains('show')) {

                myDropdown.classList.remove('show');

            }

        }

    }

</script>

单个的点击展示下拉菜单比较简单。比如点击右上角的设置按钮会弹出修改密码和退出功能等。

多个的点击式下拉菜单导航：https://www.cnblogs.com/mzzone/p/10994867.html

巴特西

js （单个的）点击式下拉菜单

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