使用Bootstrap CDN for Django时未出现导航栏可能是由以下原因导致的:
<!-- 引入Bootstrap的CSS文件 -->
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/5.0.1/css/bootstrap.min.css">
<!-- 引入Bootstrap的JavaScript文件,需在jQuery之后引入 -->
<script src="https://cdn.staticfile.org/jquery/3.6.0/jquery.min.js"></script>
<script src="https://cdn.staticfile.org/twitter-bootstrap/5.0.1/js/bootstrap.min.js"></script>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Logo</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Services</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Contact</a>
</li>
</ul>
</div>
</nav>
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