Error: getaddrinfo ENOTFOUND loc

Error: getaddrinfo ENOTFOUND localhost
    at errnoException (dns.js:50:10)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:92:26)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! vue-admin-template@3.6.0 dev: `webpack-dev-server --inline --progress --config build/webpack.dev.conf.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the vue-admin-template@3.6.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

原因：
没有指定 localhost，在host文件中添加如下内容：

127.0.0.1 localhost

mac系统：sudo vim /etc/hosts