Expo Init项目中出现“错误：spawn cmd ENOENT”

Question

我正在使用开始一个新的React-Native项目

博览会init firstexpo

但是我在命令提示符处收到此错误

错误：生成cmd ENOENT

PS C:\Users\Alex\testing\firstexpo> expo start
[16:21:09] Starting project at C:\Users\Alex\testing\firstexpo
[16:21:11] Expo DevTools is running at http://localhost:19002
[16:21:11] Opening DevTools in the browser... (press shift-d to disable)
Error: spawn cmd ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:232:19)
    at onErrorNT (internal/child_process.js:407:16)
    at process._tickCallback (internal/process/next_tick.js:63:19)
PS C:\Users\Alex\testing\firstexpo>

npm启动错误找不到模块“ opn”

[16:38:49] Starting project at C:\Users\Alex\testing\firstexpo
[16:38:52] Expo DevTools is running at http://localhost:19002
[16:38:52] Opening DevTools in the browser... (press shift-d to disable)
[16:38:52] Cannot find module 'opn'
[16:38:52] Set EXPO_DEBUG=true in your env to view the stack trace.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! empty-project-template@ start: `expo start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the empty-project-template@ start 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\Alex\AppData\Roaming\npm-cache\_logs\2018-11-24T08_38_52_344Z-debug.log

我对编码非常陌生，谁能告诉我如何解决该问题？非常感谢你。

降级至v28

Answer 1

我用这个解决了我的错误。“％SystemRoot％\ system32;” 在PATH变量中。