我无法在我的下拉菜单（在手机上）和我的酒吧图标上添加任何过渡效果。我应该在哪里放置转换代码？另一方面，在悬停时改变字体颜色等转换成功。我认为我的代码结构可能有问题，但我看不到任何东西。
$(document).ready(function() {
$('.menu-toggle').click(function() {
$(this).toggleClass('active');
$('nav').toggleClass('active');
});
});body {
margin: 0;
padding: 0;
font-family: Lato, sans-serif;
background-color: #333;
height: 200vh;
}
a {
text-decoration: none;
}
.clearfix {
clear: both;
}
header {
position: fixed;
width: 100%;
padding: 1vh 15vw;
min-height: 100px;
box-sizing: border-box;
background-color: #fff;
}
.logo {
color: #417475;
text-transform: uppercase;
font-weight: bold;
font-size: 35px;
height: 100px;
line-height: 100px;
float: left;
}
nav {
float: right;
}
nav ul {
display: flex;
}
nav ul li {
list-style: none;
}
nav ul li a {
display: block;
margin: 10px 0;
padding: 10px 20px;
}
nav ul li a:hover {
color: #417475;
}
.menu-toggle {
display: none;
float: right;
margin-top: 35px;
font-size: 30px;
cursor: pointer;
}
.menu-toggle:before {
content: '\f0c9';
font-family: fontAwesome;
height: 30px;
}
.menu-toggle.active:before {
content: '\f00d';
}
@media screen and (max-width: 768px) {
.menu-toggle {
display: block;
}
nav {
display: none;
}
nav.active {
display: block;
width: 100%;
}
nav.active ul {
display: block;
}
nav.active ul li a {
margin: 0;
text-align: center;
}
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!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>Portfolio 1</title>
<link rel="stylesheet" href="style.css">
<link href="https://fonts.googleapis.com/css?family=Lato" rel="stylesheet">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
</head>
<body>
<header>
<a href="#" class="logo">Logo</a>
<div class="menu-toggle"></div>
<nav>
<ul>
<li><a href="#">Home</a></li>
<li><a href="#">Offer</a></li>
<li><a href="#">Portfolio</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Contact</a></li>
</ul>
</nav>
<div class="clearfix"></div>
</header>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script src="script.js"></script>
</body>
</html>当您使用它添加某种变换时，过渡会起作用。我尝试了以下，它就像一个魅力。
.menu-toggle.active {
transition: 3s;
transform: rotate(-180deg);
}
希望能给出更多的澄清。
你实际上是在display和<nav>之间切换none的block。这只是使<nav>出现和消失。如果你想制作动画，那么你可以通过使用bootstrap类来创建一个实际的下拉列表，如下所示;
$(document).ready(function(){
$('.menu-toggle').on('click',function(){
$('.menu-toggle').toggleClass('active');
});
});<!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>Portfolio 1</title>
<link href="https://fonts.googleapis.com/css?family=Lato" rel="stylesheet">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="adding_transition.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<style>
body {
margin: 0;
padding: 0;
font-family: Lato, sans-serif;
background-color: #333;
height: 200vh;
/* transition: all 0.3s; */
}
a {
text-decoration: none;
}
.clearfix {
clear: both;
}
header {
position: fixed;
width: 100%;
padding: 1vh 15vw;
min-height: 100px;
box-sizing: border-box;
background-color: #fff;
}
.logo {
color: #417475;
text-transform: uppercase;
font-weight: bold;
font-size: 35px;
height: 100px;
line-height: 100px;
float: left;
/* transition: all 0.3s ease; */
}
nav {
float: right;
transition: all 0.3s;
}
nav ul {
display: flex;
}
nav ul li {
list-style: none;
}
nav ul li a {
display: block;
margin: 10px 0;
padding: 10px 20px;
}
nav ul li a:hover {
color: #417475;
}
.menu-toggle {
display: none;
float: right;
margin-top: 35px;
font-size: 30px;
cursor: pointer;
}
.menu-toggle:before {
content: '\f0c9';
font-family: fontAwesome;
height: 30px;
}
.menu-toggle.active:before {
content: '\f00d';
}
.animate
{
transition: all 0.3s;
}
@media screen and (max-width: 768px) {
.menu-toggle {
display: block;
}
nav {
display: block;
width: 100%;
}
nav ul {
display: block;
}
nav ul li a {
margin: 0;
text-align: center;
}
}
</style>
</head>
<body>
<header>
<a href="#" class="logo">Logo</a>
<a href="#list_drop" data-toggle="collapse" aria-expanded="false" ><div class="menu-toggle"></div></a>
<nav>
<ul id="list_drop" class="collapse list-unstyled">
<li><a href="#">Home</a></li>
<li><a href="#">Offer</a></li>
<li><a href="#">Portfolio</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Contact</a></li>
</ul>
</nav>
<div class="clearfix"></div>
</header>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script src="script.js"></script>
</body>
</html>警告：您与html链接的CSS必须在引导CDN之后，否则您在.clearfox上应用的CSS将无效。
这就是我使用嵌入式（在html文档中）CSS的原因。