执行appium 启动命令：
appium --log-timestamp
无法启动成功，并有提示如下：
2020-07-13 07:32:48:654 - [HTTP] Could not start REST http interface listener. The requested port may already be in use. Please make sure there is no other instance of this server running already.
Fatal Error: listen EADDRINUSE: address already in use 0.0.0.0:4723
at Server.setupListenHandle [as _listen2] (net.js:1309:16)
at listenInCluster (net.js:1357:12)
at doListen (net.js:1496:7)
at processTicksAndRejections (internal/process/task_queues.js:85:21)
解决方法：在终端输入命令：killall -9 node