问题：axios 配置 baseURL 报错
解决方案：
重新安装老版本 axios
npm i axios@0.19.0 -S
OVER~
检查了确定写法没有问题，清除缓存无效。
想到前两天升级了浏览器，于是换个浏览器，还是报错。
卸载重新安装无效。
npm i axios -S
npm i axios 默认安装最新版本
于是回退到之前的版本就解决了
翻了半天资料也没找到为啥会报错，先继续开发吧~
axios 配置baseURL 报错 Uncaught TypeError: Cannot set properties of undefined (setting 'baseURL')
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