在"head"中:

<link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="css/style.css">

在身体"中:

<script src="js/jquery-3.2.1.min.js"></script>
<script src="js/popper.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script src="js/custom.min.js"></script>

尝试使用缩小版，因为它们较小，因此加载速度更快

Try using the minified version they are much smaller therfore much faster to load