js （单个的）点击式下拉菜单

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<!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>