node.js   throw er; // Unhandled 'error' event错误原因

events.js:141

throw er; // Unhandled 'error' event

^

Error: listen EADDRINUSE :::9000

at Object.exports._errnoException (util.js:907:11)

at exports._exceptionWithHostPort (util.js:930:20)

at Server._listen2 (net.js:1250:14)

at listen (net.js:1286:10)

at Server.listen (net.js:1382:5)

at EventEmitter.listen(/Users/chaoge/Downloads/cocosjs/server/server/node_modules/express/lib/application.js:617:24)

at Object.exports.start(/Users/chaoge/Downloads/cocosjs/server/server/account_server/account_server.js:19:6)

at Object.<anonymous>(/Users/chaoge/Downloads/cocosjs/server/server/account_server/app.js:11:4)

at Module._compile (module.js:409:26)

at Object.Module._extensions..js (module.js:416:10)

出现该提示是因为端口被占用