我正在使用Bootstrap 4，并且希望导航栏切换图标（称为“汉堡”菜单）更改:hover状态的颜色。这是我一直在尝试的方法，但无法正常工作：
.navbar-light .navbar-toggler .menu-icon:hover,
.navbar-light .navbar-toggler .menu-icon:active,
.navbar-light .navbar-toggler .menu-icon:focus {
color: red !important;
}
这是我的代码：
.navbar-light .navbar-toggler .menu-icon:hover,
.navbar-light .navbar-toggler .menu-icon:active,
.navbar-light .navbar-toggler .menu-icon:focus {
color: red !important;
}<nav class="navbar navbar-expand-lg navbar-light bg-white">
<a class="navbar-brand" href="index.html">
<img src="images/logo-paygol.svg" alt="Logo Paygol">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTopMenu" aria-controls="navbarTopMenu" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon menu-icon"></span>
</button></nav>嘿，据我所知，bootstrap 4正在使用图像URL添加图标。这意味着它是图像，您不能添加hover图像。但是有一个回旋处。
因此，您必须使用自定义图标并按如下所示为其添加悬停，在本示例中将使用fontawesome。
.navbar button.navbar-toggler:hover {
color: red;
}
/* or
.navbar .navbar-toggler span:hover i {
color: red;
}
/*
/*
or
.navbar .navbar-toggler span i:hover {
color: red;
}
*/<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css" integrity="sha512-1PKOgIY59xJ8Co8+NE6FZ+LOAZKjy+KY8iq0G4B3CyeY6wYHN3yt9PW0XpSriVlkMXe40PTKnXrLnZ9+fkDaog==" crossorigin="anonymous" />
<!-- CSS only -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<!-- <span class="navbar-toggler-icon"></span> -->
<span><i class="fas fa-bars"></i></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<!-- JS, Popper.js, and jQuery -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script>如您所见，我确实在此处替换了图标引导程序使用的
<span class="navbar-toggler-icon"></span>
我从fontawesome使用了我的如下
<span><i class="fas fa-bars"></i></span>
现在悬停效果就可以了，因为它是一种字体，您可以非常容易地更改颜色和大小。
我希望能回答您的问题。如果没有，请告诉我。我会尽力编辑答案以适合您的问题。
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我来说两句