npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! [email protected] dev: `node build/dev-server.js`

npm ERR! Exit status 1

npm ERR!

npm ERR! Failed at the [email protected] dev 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!     D:\nodejs\node_cache\_logs\2019-08-13T08_44_02_656Z-debug.log

报错原因是：服务端口被占用，需要修改端口