运行create-react-app构建脚本时如何设置build .env变量?
我在create-react-app中使用以下环境变量: console.log(process.env.REACT_APP_API_URL) // http://localhost:5555 当我npm start通过读取.env文件运行时它起作用: REACT_APP_API_URL=http://localhost:5555 我如何像http://localhost:1234执行a一样设置其他值npm run build? 这是我的package.json文件: { "name": "webapp", "version": "0.1.0", "private": true, "devDependencies": { "react-scripts": "0.9.0" }, "dependencies": { "react": "^15.4.2", "react-dom": "^15.4.2" }, "scripts": { "start": "react-scripts start", "build": "react-scripts build", "test": "react-scripts test --env=jsdom", "eject": "react-scripts eject" } }