vue项目启动报错 Error: spawn cmd ENOENT

一、yarn serve 启动vue项目，如下报错：

Type checking in progress...

  App running at:
  - Local:   http://localhost:8080/crmpc/ 
  - Network: http://172.20.3.3:8080/      

  Note that the development build is not optimized.
  To create a production build, run yarn build.

events.js:352
      throw er; // Unhandled 'error' event
      ^

Error: spawn cmd ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:269:19)
    at onErrorNT (internal/child_process.js:467:16)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)
Emitted 'error' event on ChildProcess instance at:
    at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12)
    at onErrorNT (internal/child_process.js:467:16)
    at processTicksAndRejections (internal/process/task_queues.js:82:21) {
  errno: -4058,
  code: 'ENOENT',
  syscall: 'spawn cmd',
  path: 'cmd',
  spawnargs: [ '/c', 'start', '""', '/b', 'http://172.20.3.3:8080' ]
}
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

二、报错原因：

电脑缺少cmd运行程序的环境变量

三、解决方案：

环境变量Path中添加C:\Windows\System32或者 %SystemRoot%\system32
具体步骤：
右键我的电脑--高级系统设置--高级--环境变量--系统变量，找到Path，添加就可以了

注意：设置完记得关闭vscode，重新启动vscode才可以生效哦！