bootstrap怎么引入联网文件

<code class="html"><link rel="stylesheet" href="https://maxcdn.&lt;a%20style=\'color:#f60;%20text-decoration:underline;\'%20href=" https: target="_blank">bootstrapcdn.com/bootstrap/4.5.2/<a style="color:#f60; text-decoration:underline;" href="https://www.php.cn/zt/15716.html" target="_blank">css</a>/bootstrap.min.css"&gt;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script><script src="https://cdn.jsdelivr.net/npm/bootstrap@4.5.2/dist/js/bootstrap.min.js"></script>