参考：https://blog.csdn.net/u010881899/article/details/80895661
例：引入element-ui
js：
mounted() {
const oScript = document.createElement('script');
oScript.type = 'text/javascript';
oScript.src = 'https://unpkg.com/element-ui@2.3.7/lib/index.js';
document.body.appendChild(oScript);
}
css:
<style scoped>
@import 'https://unpkg.com/element-ui@2.3.7/lib/theme-chalk/index.css';
</style>
