前端库CDN

jquery

<script src="//cdn.jsdelivr.net/npm/jquery@3/dist/jquery.min.js"></script>

bootstrap 3

<script src="//cdn.jsdelivr.net/combine/npm/jquery@3,npm/bootstrap@3/dist/js/bootstrap.min.js"></script>
<script src="//cdn.jsdelivr.net/npm/bootstrap@3/dist/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="//cdn.jsdelivr.net/npm/bootstrap@3/dist/css/bootstrap.min.css">

bootstrap 4

<script src="//cdn.jsdelivr.net/combine/npm/jquery@3,npm/bootstrap@4/dist/js/bootstrap.min.js"></script>
<script src="//cdn.jsdelivr.net/npm/bootstrap@4/dist/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="//cdn.jsdelivr.net/npm/bootstrap@4/dist/css/bootstrap.min.css">

vue

<script src="//cdn.jsdelivr.net/npm/vue/dist/vue.min.js"></script>