React如何配置env环境变量

React版本： "react": "^18.2.0"

1、在package.json平级目录下创建**'.env'**文件

2、在'.env'文件里配置环境变量

【1】PUBLIC_URL

描述：编译时文件的base-href

官方描述：

// We use `PUBLIC_URL` environment variable or "homepage" field to infer
// "public path" at which the app is served.
// webpack needs to know it to put the right <script> hrefs into HTML even in
// single-page apps that may serve index.html for nested URLs like /todos/42.
// We can't use a relative path in HTML because we don't want to load something
// like /todos/42/static/js/bundle.7289d.js. We have to know the root.
const publicUrlOrPath = getPublicUrlOrPath(
  process.env.NODE_ENV === 'development',
  require(resolveApp('package.json')).homepage,
  process.env.PUBLIC_URL
);

配置方式：

PUBLIC_URL = '/zyk'

效果：

编译后的文件都增加了'/zyk'前缀

【2】BUILD_PATH

描述：编译后文件夹名称，默认是'build'

配置方式：

BUILD_PATH = 'dist'

效果：