我正在使用 Bootstrap 5 创建一个网站，并使用它在我的导航栏中创建一个下拉菜单。当您将鼠标悬停在桌面上的下拉菜单上时，它应该打开，当您在移动设备上单击下拉菜单时，它应该打开，当您再次单击它时，它应该关闭，但现在它只是打开。
##测试.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Test Navbar</title>
<!-- <meta name="description" content="Write an awesome description for your new site here. It will appear in your document head meta (for Google search results) and in your feed.xml site description." /> -->
<link rel="stylesheet" href="/_bridgetown/static/css/main.c7d4dd3f1984a290e9be.css" />
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<link rel="stylesheet" href="../css/dropdown.css" />
<!-- <link rel="stylesheet" href="./css/dropdown.css" /> -->
<link
rel="stylesheet"
data-purpose="Layout StyleSheet"
title="Default"
disabled
href="/css/app-937c1ff7d52fd6f78dd9322599e2b5d4.css?vsn=d"
>
<link
rel="stylesheet"
data-purpose="Layout StyleSheet"
title="Web Awesome"
href="/css/app-wa-8d95b745961f6b33ab3aa1b98a45291a.css?vsn=d"
>
<link
rel="stylesheet"
href="https://site-assets.fontawesome.com/releases/v6.4.0/css/all.css"
>
<link
rel="stylesheet"
href="https://site-assets.fontawesome.com/releases/v6.4.0/css/sharp-solid.css"
>
<link
rel="stylesheet"
href="https://site-assets.fontawesome.com/releases/v6.4.0/css/sharp-regular.css"
>
<link
rel="stylesheet"
href="https://site-assets.fontawesome.com/releases/v6.4.0/css/sharp-light.css"
>
<link rel="icon" type="image/x-icon" href="/Bootstrap-/images/favicon-32x32.png">
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
<!-- NAVIGATION BAR START -->
<nav class="navbar navbar-expand-lg navbar-light py-3 sticky-top" id="navbar-color">
<div class="container">
<a href="/Bootstrap-/index.html">
<img src="./src/img/logo-topnav.png" height="45" width="225" class="img-fluid"/>
</a>
<!-- TOGGLE MENU START -->
<button
type="button"
class="navbar-toggler"
data-bs-toggle="collapse"
data-bs-target="#navmenu"
>
<span class="navbar-toggler-icon">
</button>
<!-- TOGGLE MENU CLOSE -->
<!-- TOGGLE MENU START -->
<div class="collapse navbar-collapse" id="navmenu">
<ul class="navbar-nav ms-auto">
<li class="nav-item"><a href="/Bootstrap-/index.html" class="nav-link text-white" id="nav_object">Home</a></li>
<li class="nav-item"><a href="/Bootstrap-/about.html" class="nav-link text-white" id="nav_object">About</a></li>
<li class="nav-item dropdown" id="dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false" id="">
Services
</a>
<ul class="dropdown-menu">
<!-- <li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li> -->
<!-- <li><hr class="dropdown-divider"></li> -->
<li><a class="dropdown-item text-white" href="/Bootstrap-/cctv.html">CCTV Services</a></li>
<li><a class="dropdown-item text-white " href="/Bootstrap-/datacenter.html">Datacenter Support</a></li>
<li><a class="dropdown-item text-white" href="/Bootstrap-/digital-signage.html">Digital Signage</a></li>
<li><a class="dropdown-item text-white" href="/Bootstrap-/gen-support.html">General Support</a></li>
<li><a class="dropdown-item text-white " href="/Bootstrap-/net-support.html">Network Support</a></li>
<li><a class="dropdown-item text-white " href="/Bootstrap-/pos.html">POS Services</a></li>
<li><a class="dropdown-item text-white " href="/Bootstrap-/telecom.html">Telecom Services</a></li>
</ul>
</li>
<li class="nav-item"><a href="/Bootstrap-/contact.html" class="nav-link text-white" id="nav_object">Contact</a></li>
<script>
// Get the Services dropdown link element
const servicesDropdown = document.getElementById('servicesDropdown');
// Redirect to the services page when the dropdown link is clicked
servicesDropdown.addEventListener('click', function(event) {
event.preventDefault(); // Prevent default link behavior
window.location.href = this.getAttribute('href');
});
// Add the hover effect on desktop devices
if (window.matchMedia('(min-width: 576px)').matches) {
// When the mouse enters the dropdown link, show the dropdown menu
servicesDropdown.addEventListener('mouseenter', function() {
this.setAttribute('aria-expanded', 'true');
this.nextElementSibling.classList.add('show');
});
// When the mouse leaves the dropdown link or the dropdown menu, hide the dropdown menu
servicesDropdown.addEventListener('mouseleave', function() {
this.setAttribute('aria-expanded', 'false');
this.nextElementSibling.classList.remove('show');
});
}
</script>
<!-- TOGGLE MENU CLOSE -->
<!-- LOGIN/SIGNUP MODAL SECTION START -->
<!-- <button
type="button"
class="btn btn-primary"
data-bs-toggle="modal"
data-bs-target="#loginmodal"
>
Login/Signup
</button>
<div id="loginmodal" class="modal fade">
<div class="modal-dialog modal-dialog-centered">
<div class="modal-content">
<div class="modal-body">
<button
type="button"
class="btn-close btn-close-white"
data-bs-dismiss="modal"
></button>
<div class="myform bg-dark">
<h1 class="text-center" id="modal-styling">Login Form</h1>
<form action="#">
<div class="mb-3 mt-3">
<label for="email">Email Address</label>
<input type="email" class="form-control">
</div>
<div class="mb-3 mt-3">
<label for="password">Password</label>
<input type="passeord" class="form-control">
</div>
<button type="button" class="btn btn-light mt-3">LOGIN</button>
<p id="modal-styling">Don't have an account? <a href="#" id="modal-styling">Signup</a> </p>
</form>
</div>
</div>
</div>
</div>
</div> -->
<!-- LOGIN/SIGNUP MODAL SECTION CLOSE -->
</ul>
</div>
<!-- TOGGLE MENU CLOSE -->
</div>
</nav>
<!-- NAVIGATION BAR CLOSE -->
</body>
</html>
.navbar-light .navbar-toggler {
border: 1px solid hsl(0, 0%, 100%);
outline: none;
box-shadow: none;
}
#nav_object {
position: relative;
}
.dropdown:hover .dropdown-menu {
display: block;
background-color: hsl(210, 45%, 30%);
}
.dropdown-item:hover {
background-color: hsl(210, 55%, 41%);
}
#dropdown:hover .dropdown-menu {
display: block;
}
.dropdown-toggle {
color: white !important;
}
#navbar-color {
background-color: hsl(210, 45%, 30%);
}
.navbar-light .navbar-toggler-icon {
background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}
.nav-link {
position: relative;
}
.dropdown:hover .dropdown-menu {
display: block;
background-color: hsl(210, 45%, 30%);
}
.dropdown-item:hover {
background-color: hsl(210, 55%, 41%);
}
#nav_object::after {
content: '';
opacity: 0;
transition: all 0.2s;
height: 2px;
width: 100%;
background: hsl(18, 100%, 62%);
position: absolute;
bottom: 0;
left: 0;
}
#nav_object:hover::after {
opacity: 1;
}
@media screen and (max-width: 576px) {
.dropdown:hover > .dropdown-menu {
display: block;
margin-top: 0;
}
}
.navbar-light .navbar-toggler {
border: 1px solid hsl(0, 0%, 100%);
outline: none;
box-shadow: none;
}
#nav_object {
position: relative;
}
.dropdown:hover .dropdown-menu {
display: block;
background-color: hsl(210, 45%, 30%);
}
.dropdown-item:hover {
background-color: hsl(210, 55%, 41%);
}
#dropdown:hover .dropdown-menu {
display: block;
}
.dropdown-toggle {
color: white !important;
}
#navbar-color {
background-color: hsl(210, 45%, 30%);
}
.navbar-light .navbar-toggler-icon {
background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}
.nav-link {
position: relative;
}
.dropdown:hover .dropdown-menu {
display: block;
background-color: hsl(210, 45%, 30%);
}
.dropdown-item:hover {
background-color: hsl(210, 55%, 41%);
}
#nav_object::after {
content: '';
opacity: 0;
transition: all 0.2s;
height: 2px;
width: 100%;
background: hsl(18, 100%, 62%);
position: absolute;
bottom: 0;
left: 0;
}
#nav_object:hover::after {
opacity: 1;
}
@media screen and (max-width: 576px) {
.dropdown:hover > .dropdown-menu {
display: block;
margin-top: 0;
}
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Test Navbar</title>
<!-- <meta name="description" content="Write an awesome description for your new site here. It will appear in your document head meta (for Google search results) and in your feed.xml site description." /> -->
<link rel="stylesheet" href="/_bridgetown/static/css/main.c7d4dd3f1984a290e9be.css" />
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<link rel="stylesheet" href="../css/dropdown.css" />
<!-- <link rel="stylesheet" href="./css/dropdown.css" /> -->
<link
rel="stylesheet"
data-purpose="Layout StyleSheet"
title="Default"
disabled
href="/css/app-937c1ff7d52fd6f78dd9322599e2b5d4.css?vsn=d"
>
<link
rel="stylesheet"
data-purpose="Layout StyleSheet"
title="Web Awesome"
href="/css/app-wa-8d95b745961f6b33ab3aa1b98a45291a.css?vsn=d"
>
<link
rel="stylesheet"
href="https://site-assets.fontawesome.com/releases/v6.4.0/css/all.css"
>
<link
rel="stylesheet"
href="https://site-assets.fontawesome.com/releases/v6.4.0/css/sharp-solid.css"
>
<link
rel="stylesheet"
href="https://site-assets.fontawesome.com/releases/v6.4.0/css/sharp-regular.css"
>
<link
rel="stylesheet"
href="https://site-assets.fontawesome.com/releases/v6.4.0/css/sharp-light.css"
>
<link rel="icon" type="image/x-icon" href="/Bootstrap-/images/favicon-32x32.png">
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
<!-- NAVIGATION BAR START -->
<nav class="navbar navbar-expand-lg navbar-light py-3 sticky-top" id="navbar-color">
<div class="container">
<a href="/Bootstrap-/index.html">
<img src="./src/img/logo-topnav.png" height="45" width="225" class="img-fluid"/>
</a>
<!-- TOGGLE MENU START -->
<button
type="button"
class="navbar-toggler"
data-bs-toggle="collapse"
data-bs-target="#navmenu"
>
<span class="navbar-toggler-icon">
</button>
<!-- TOGGLE MENU CLOSE -->
<!-- TOGGLE MENU START -->
<div class="collapse navbar-collapse" id="navmenu">
<ul class="navbar-nav ms-auto">
<li class="nav-item"><a href="/Bootstrap-/index.html" class="nav-link text-white" id="nav_object">Home</a></li>
<li class="nav-item"><a href="/Bootstrap-/about.html" class="nav-link text-white" id="nav_object">About</a></li>
<li class="nav-item dropdown" id="dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false" id="">
Services
</a>
<ul class="dropdown-menu">
<!-- <li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li> -->
<!-- <li><hr class="dropdown-divider"></li> -->
<li><a class="dropdown-item text-white" href="/Bootstrap-/cctv.html">CCTV Services</a></li>
<li><a class="dropdown-item text-white " href="/Bootstrap-/datacenter.html">Datacenter Support</a></li>
<li><a class="dropdown-item text-white" href="/Bootstrap-/digital-signage.html">Digital Signage</a></li>
<li><a class="dropdown-item text-white" href="/Bootstrap-/gen-support.html">General Support</a></li>
<li><a class="dropdown-item text-white " href="/Bootstrap-/net-support.html">Network Support</a></li>
<li><a class="dropdown-item text-white " href="/Bootstrap-/pos.html">POS Services</a></li>
<li><a class="dropdown-item text-white " href="/Bootstrap-/telecom.html">Telecom Services</a></li>
</ul>
</li>
<li class="nav-item"><a href="/Bootstrap-/contact.html" class="nav-link text-white" id="nav_object">Contact</a></li>
<script>
// Get the Services dropdown link element
const servicesDropdown = document.getElementById('servicesDropdown');
// Redirect to the services page when the dropdown link is clicked
servicesDropdown.addEventListener('click', function(event) {
event.preventDefault(); // Prevent default link behavior
window.location.href = this.getAttribute('href');
});
// Add the hover effect on desktop devices
if (window.matchMedia('(min-width: 576px)').matches) {
// When the mouse enters the dropdown link, show the dropdown menu
servicesDropdown.addEventListener('mouseenter', function() {
this.setAttribute('aria-expanded', 'true');
this.nextElementSibling.classList.add('show');
});
// When the mouse leaves the dropdown link or the dropdown menu, hide the dropdown menu
servicesDropdown.addEventListener('mouseleave', function() {
this.setAttribute('aria-expanded', 'false');
this.nextElementSibling.classList.remove('show');
});
}
</script>
<!-- TOGGLE MENU CLOSE -->
<!-- LOGIN/SIGNUP MODAL SECTION START -->
<!-- <button
type="button"
class="btn btn-primary"
data-bs-toggle="modal"
data-bs-target="#loginmodal"
>
Login/Signup
</button>
<div id="loginmodal" class="modal fade">
<div class="modal-dialog modal-dialog-centered">
<div class="modal-content">
<div class="modal-body">
<button
type="button"
class="btn-close btn-close-white"
data-bs-dismiss="modal"
></button>
<div class="myform bg-dark">
<h1 class="text-center" id="modal-styling">Login Form</h1>
<form action="#">
<div class="mb-3 mt-3">
<label for="email">Email Address</label>
<input type="email" class="form-control">
</div>
<div class="mb-3 mt-3">
<label for="password">Password</label>
<input type="passeord" class="form-control">
</div>
<button type="button" class="btn btn-light mt-3">LOGIN</button>
<p id="modal-styling">Don't have an account? <a href="#" id="modal-styling">Signup</a> </p>
</form>
</div>
</div>
</div>
</div>
</div> -->
<!-- LOGIN/SIGNUP MODAL SECTION CLOSE -->
</ul>
</div>
<!-- TOGGLE MENU CLOSE -->
</div>
</nav>
<!-- NAVIGATION BAR CLOSE -->
</body>
</html>如果您正在谈论服务导航栏在单击时未关闭，可能是因为您的 css .dropdown:hover 弄乱了 bootstrap 的 css。
.dropdown:hover .dropdown-menu {
display: block;
background-color: hsl(210, 45%, 30%);
}
此外，您的代码中有不必要的重复项。