Vue Error: getaddrinfo ENOTFOUND

lean-webpack-plugin: /Users/elviszhu/Desktop/LksProject/Lks.S/Web/Lks.Passport.New/build/dist has been removed.
 10% building modules 8/8 modules 0 activeevents.js:160
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRNOTAVAIL 172.0.0.1:8080
    at Object.exports._errnoException (util.js:1026:11)
    at exports._exceptionWithHostPort (util.js:1049:20)
    at Server._listen2 (net.js:1249:19)
    at listen (net.js:1298:10)
    at net.js:1397:7
    at GetAddrInfoReqWrap.asyncCallback [as callback] (dns.js:62:16)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:81:10)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! lks-passport@1.0.0 dev: `webpack-dev-server --watch-content-base --inline --progress --config build/webpack.dev.js`

一脸懵逼刚开始，无缘无故报错了。
一查发现原来是我误删了 switchHosts中的127.0.0.1 localhost这一东西

解决办法
没有指定 localhost，在host文件中添加如下内容：
127.0.0.1 localhost

推荐下载个switchHosts随意切换host~~~