我相信我正确地链接到引导脚本和样式表，但是.navbar-inverse和.bg-inverse似乎没有像我期望的那样使Navbar背景变暗。我做错了什么，我该如何解决？
<!DOCTYPE html>
<html>
<head>
<title>My Coffee</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css"/>
<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-inverse bg-inverse">
<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>
</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">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
</body>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"></script>
</html>
答案 0 :(得分：0)
我认为您使用的是Bootstrap测试版。使用Alpha版本。它将解决问题。这是来自bootstrap站点的注释代码。