代码下下来后执行 `npm run dev` 时产生错误信息

[Phoenix500526]

在代码下下来后，进入终端执行 npm run dev时产生了错误信息如下： $ npm run dev

@fe_korey/[email protected] dev C:\学习盘D\cv cross-env NODE_ENV=development webpack-dev-server --hot

Happy[babel]: Version: 5.0.1. Threads: 3 × ｢wds｣: Error: listen EADDRINUSE: address already in use 0.0.0.0:8080 at Server.setupListenHandle [as _listen2] (net.js:1318:16) at listenInCluster (net.js:1366:12) at doListen (net.js:1503:7) at processTicksAndRejections (internal/process/task_queues.js:81:21) { code: 'EADDRINUSE', errno: -4091, syscall: 'listen', address: '0.0.0.0', port: 8080 } Happy[babel]: All set; signaling webpack to proceed. Happy[less]: Version: 5.0.1. Threads: 3 Happy[less]: All set; signaling webpack to proceed. Happy[css]: Version: 5.0.1. Threads: 3 Happy[css]: All set; signaling webpack to proceed. i Compiling Webpack

webpack v4.44.2

60395c28de16fe5499d3 size name module status 52 B 0 multi (webpack)-dev-server/client?http://0.0.0.0:8080 (webpack)/hot/dev-server.js ./src/index.js built 4.15 kB SockJSClient.js (webpack)-dev-server/client/clients/SockJSClient.js built 4.39 kB 0.0.0.0:8080 (webpack)-dev-server/client?http://0.0.0.0:8080 built 3.6 kB overlay.js (webpack)-dev-server/client/overlay.js built 1.57 kB socket.js (webpack)-dev-server/client/socket.js built 2.98 kB createSocketUrl.js (webpack)-dev-server/client/utils/createSocketUrl.js built 964 B log.js (webpack)-dev-server/client/utils/log.js built 1.63 kB reloadApp.js (webpack)-dev-server/client/utils/reloadApp.js built 402 B sendMessage.js (webpack)-dev-server/client/utils/sendMessage.js built 170 B log$ (webpack)/hot sync nonrecursive ^./log$ built 1.63 kB dev-server.js (webpack)/hot/dev-server.js built 75 B emitter.js (webpack)/hot/emitter.js built 1.3 kB log-apply-result.js (webpack)/hot/log-apply-result.js built 1.37 kB log.js (webpack)/hot/log.js built 1.43 kB index.js ./src/index.js built failed ×

size name asset status 959 kB main bundle.js emitted 4.29 kB ico favicon.ico emitted 7.86 kB html index.html emitted

Δt 3621ms (20 modules hidden)

./src/index.js 261:32 error Module build failed (from ./node_modules/happypack/loader.js): Error: [BABEL] C:\学习盘D\cv\src\index.js: @babel/preset-env: The 'modules' option must be one of - 'false' to indicate no module processing - a specific module type: 'commonjs', 'amd', 'umd', 'systemjs' - 'auto' (default) which will automatically select 'false' if the current process is known to support ES module syntax, or "commonjs" otherwise (While processing: "C:\学习盘D\cv\node_modules\@babel\preset-env\lib\index.js") at OptionValidator.invariant (C:\学习盘D\cv\node_modules@babel\helper-validator-option\lib\validator.js: at validateModulesOption (C:\学习盘D\cv\node_modules@babel\preset-env\lib\normalize-options.js:82:5) at normalizeOptions (C:\学习盘D\cv\node_modules@babel\preset-env\lib\normalize-options.js:145:14) at C:\学习盘D\cv\node_modules@babel\preset-env\lib\index.js:239:37 at C:\学习盘D\cv\node_modules@babel\helper-plugin-utils\lib\index.js:19:12 at C:\学习盘D\cv\node_modules@babel\core\lib\config\full.js:211:14 at Generator.next () at Function. (C:\学习盘D\cv\node_modules@babel\core\lib\gensync-utils\async.js:26:3) at Generator.next ()

× 1 problem (1 error, 0 warnings) √ Webpack: Compiled with some errors in 2.66s × ｢wdm｣: ERROR in ./src/index.js Module build failed (from ./node_modules/happypack/loader.js): Error: [BABEL] C:\学习盘D\cv\src\index.js: @babel/preset-env: The 'modules' option must be one of

• 'false' to indicate no module processing
• a specific module type: 'commonjs', 'amd', 'umd', 'systemjs' - 'auto' (default) which will automatically select 'false' if the current process is known to support ES module syntax, or "commonjs" otherwise (While processing: "C:\学习盘D\cv\node_modules\@babel\preset-env\lib\index.js") at OptionValidator.invariant (C:\学习盘D\cv\node_modules@babel\helper-validator-option\lib\validator.js:48:13) at validateModulesOption (C:\学习盘D\cv\node_modules@babel\preset-env\lib\normalize-options.js:82:5) at normalizeOptions (C:\学习盘D\cv\node_modules@babel\preset-env\lib\normalize-options.js:145:14) at C:\学习盘D\cv\node_modules@babel\preset-env\lib\index.js:239:37 at C:\学习盘D\cv\node_modules@babel\helper-plugin-utils\lib\index.js:19:12 at C:\学习盘D\cv\node_modules@babel\core\lib\config\full.js:211:14 at Generator.next () at Function. (C:\学习盘D\cv\node_modules@babel\core\lib\gensync-utils\async.js:26:3) at Generator.next () at step (C:\学习盘D\cv\node_modules\gensync\index.js:261:32) i ｢wdm｣: Failed to compile.

按照谷歌的结果，我执行了如下命令： npm install @babel/core @babel/preset-env 结果依然如此。从编译结果，不知道是否是因为版本的原因。另外，我也把 flqin 的相关主题代码下下来跑了一下，编译能成功，运行也没有问题，所以应该不是端口占用的问题，楼主是否可以解决一下？ 我的环境是 win10专业版 + npm-6.14.8

[JoeyBling]

@Phoenix500526 感谢反馈，现已修复。拉取最新代码即可

000809bced6b8dbc053a65f5864f070ca19d869c