Vue 下创建 vue.config.js时，

module.exports = {
    baseUrl: process.env.NODE_ENV === 'production' ? './' : '/', //根路径
    outputDir: 'dist', //构建输出目录
};

会抛以下错误：ERROR  Invalid options in vue.config.js: "baseUrl" is not allowed

PS E:\PHPCMS\htdocs\www.aerchi.com\vue\demo-cli4> npm run build

> demo-cli4@0.1.0 build E:\PHPCMS\htdocs\www.aerchi.com\vue\demo-cli4

 ERROR  Invalid options in vue.config.js: "baseUrl" is not allowed
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! demo-cli4@0.1.0 build: `vue-cli-service build`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the demo-cli4@0.1.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Aerchi\AppData\Roaming\npm-cache\_logs\2020-03-09T04_59_30_160Z-debug.log

查询才知， baseUrl 已经被废除了。唉。。。换成了 publicPath .

于是，换成了

module.exports = {
    publicPath: process.env.NODE_ENV === 'production' ? './' : '/', //根路径
    outputDir: 'dist', //构建输出目录
};