js (单个的)点击式下拉菜单

深渊向深渊呼唤
<!DOCTYPE html>
<html>
<head >
    <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 >
    <a href="#home">主页</a>
    <a href="#news">新闻</a>
    <div >
        <button  onclick="myFunction()">下拉菜单</button>
        <div  >
            <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

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