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

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 one rrorNT (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 one rrorNT (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.

vue项目启动报错 Error: spawn cmd ENOENT
https://blog.51cto.com/u_15127662/3357819
　　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

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注意：设置完记得关闭vscode，重新启动vscode才可以生效哦！