文档
https://www.kancloud.cn/yunye/axios/234845
https://www.jianshu.com/p/ff8541e0976a
https://blog.csdn.net/zd1007129657/article/details/80987364
1.下载axios
cnpm install axios --save-dev
2.在main.js中引入
import axios from "axios"
vue.prototype.axios = axios
3.