常用 cdn

http://www.bootcdn.cn/

jquery

<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/jquery/1.9.1/jquery.min.js"></script>

vue

<script src="https://cdn.bootcss.com/vue/2.5.16/vue.min.js"></script>

lodash

<script src="https://cdn.bootcss.com/lodash.js/4.17.5/lodash.min.js"></script>

echarts

<script src="https://cdn.bootcss.com/echarts/4.0.4/echarts.min.js"></script>

requirejs

<script src="https://cdn.bootcss.com/require.js/2.3.5/require.min.js"></script>

zepto

<script src="https://cdn.bootcss.com/zepto/1.2.0/zepto.min.js"></script>