运行Node.js项目的时候，报错
listen EADDRINUSE :::9999 Error: listen EADDRINUSE :::9999 at Object.exports._errnoException (util.js:1026:11) at exports._exceptionWithHostPort (util.js:1049:20) at Server._listen2 (net.js:1257:14) at Server._listen2 (/Users/zhaotf/workspaces_node/folivore-api/node_modules/async-listener/index.js:51:23) at listen (net.js:1293:10) at Server.listen (net.js:1389:5) at EventEmitter.express.application.listen (/Users/zhaotf/workspaces_node/folivore-api/node_modules/express.oi/lib/index.js:130:29) at Object.listen (/Users/zhaotf/workspaces_node/folivore-api/core/log/logcat.js:67:9) at /Users/zhaotf/workspaces_node/folivore-api/server/server.js:42:10 at /Users/zhaotf/workspaces_node/folivore-api/node_modules/loopback-boot/lib/executor.js:64:5 at /Users/zhaotf/workspaces_node/folivore-api/node_modules/loopback-boot/node_modules/async/lib/async.js:251:17 at /Users/zhaotf/workspaces_node/folivore-api/node_modules/loopback-boot/node_modules/async/lib/async.js:154:25 at /Users/zhaotf/workspaces_node/folivore-api/node_modules/loopback-boot/node_modules/async/lib/async.js:248:21 at /Users/zhaotf/workspaces_node/folivore-api/node_modules/loopback-boot/node_modules/async/lib/async.js:612:34 at _combinedTickCallback (internal/process/next_tick.js:67:7) at process._tickDomainCallback (internal/process/next_tick.js:122:9) at process.fallback (/Users/zhaotf/workspaces_node/folivore-api/node_modules/async-listener/index.js:482:15) at Module.runMain (module.js:606:11) at run (bootstrap_node.js:394:7) at startup (bootstrap_node.js:149:9) at bootstrap_node.js:509:3报错原因：端口被占用
解决方式：
方式一：换端口
方式二：找出占用端口程序，kill掉
这里以9999端口为例
找出占用端口程序。
✗ sudo lsof -n -P | grep :9999 Password: GoAgentX 2659 zhaotf 20u IPv4 0xe877a1e121c8c2cb 0t0 TCP *:9999 (LISTEN) GoAgentX 2659 zhaotf 21u IPv6 0xe877a1e12174845b 0t0 TCP *:9999 (LISTEN)原来是GoAgentX占用了端口，关闭或 kill掉（kill 2659）GoAgentX，成功启动Node.js。
