npm报错 端口被占用 events.js:167 throw er; // Unhandled 'error' event Error: listen EADDRINUSE 127.0.0.1:9999

错误日志：

 1 events.js:167
 2       throw er; // Unhandled 'error' event
 3       ^
 4       
 5   Error: listen EADDRINUSE 127.0.0.1:9999
 6       at Server.setupListenHandle [as _listen2] (net.js:1330:14)
 7       at listenInCluster (net.js:1378:12)
 8       at GetAddrInfoReqWrap.doListen [as callback] (net.js:1491:7)
 9       at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:55:10)
10   Emitted 'error' event at:
11       at emitErrorNT (net.js:1357:8)
12       at process._tickCallback (internal/process/next_tick.js:63:19)

EADDRINUSE： 给定的地址已经被使用 
端口被占用

解决办法：

查询80xx端口
netstat -nao | findstr “9999”
TCP 127.0.0.1:9010 0.0.0.0:0 LISTENING 3017

杀死进程

tasklist | findstr “3017”

文章参考：

https://www.cnblogs.com/honeywei/articles/7920629.html

https://blog.csdn.net/qq_38967608/article/details/81188460