代理端口号出错
➜  vue-koa-demo git:(master) ✗ npm run dev && npm run server

> vue-koa-demo@1.0.0 dev /Users/XNW/Documents/Vuejs_workspace/vue-koa-demo
> node build/dev-server.js

[HPM] Proxy created: /auth  ->  http://localhost:8889
[HPM] Proxy created: /api  ->  http://localhost:8889
> Starting dev server...


 DONE  Compiled successfully in 5084ms                                  17:02:41

> Listening at http://localhost:8080

[HPM] Error occurred while trying to proxy request /auth/user from localhost:8080 to http://localhost:8889 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)