我正在尝试在 ng2-admin 上运行 npm start，一切正常，直到我执行 npm update 来尝试更新软件包，
之后 npm 启动并出现错误：
webpack-dev-server --config config/webpack.dev.js --progress --profile --watch --content-base src/
10% building modules 3/3 modules 0 activeError: listen EADDRINUSE 127.0.0.1:8080
at Object.exports._errnoException (util.js:1026:11)
at exports._exceptionWithHostPort (util.js:1049:20)
at Server._listen2 (net.js:1257:14)
at listen (net.js:1293:10)
at net.js:1403:9
at GetAddrInfoReqWrap.asyncCallback [as callback] (dns.js:62:16)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:81:10)
npm ERR! Darwin 15.5.0
npm ERR! argv "/Users/vm/versions/node/v6.9.1/bin/node" node/v6.9.1/bin/npm" "run" "server:dev"
npm ERR! node v6.9.1
npm ERR! npm v3.10.8
npm ERR! code ELIFECYCLE
npm ERR! [email protected] /cdn-cgi/l/email-protection server:dev: webpack-dev-server --config config/webpack.dev.js --progress --profile --watch --content-base src/
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] /cdn-cgi/l/email-protection server:dev script 'webpack-dev-server --config config/webpack.dev.js --progress --profile --watch --content-base src/'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the ng2-admin package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! webpack-dev-server --config config/webpack.
错误消息的相关部分是：listen EADDRINUSE 127.0.0.1:8080。这意味着webpack-dev-server正在尝试继续运行127.0.0.1:8080，但地址和端口已被使用。
尝试打开浏览器并输入127.0.0.1:8080进入地址栏。也许该端口上已经有另一台服务器正在运行。跑步jobs检查后台进程。
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