cdn引入vue和axios以及Qs

CDN引入：

Vue.js <script src="https://unpkg.com/vue/dist/vue.js"></script>

Axios：<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

Qs：<script src="https://cdn.bootcss.com/qs/6.5.1/qs.min.js"></script>