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events.js:291
throw er; // Unhandled 'error' event
^
Error: listen EADDRINUSE: address already in use :::80
at Server.setupListenHandle [as _listen2] (net.js:1317:16)
at listenInCluster (net.js:1365:12)
at Server.listen (net.js:1451:7)
at Function.listen (G:\Practice\code\node_modules\express\lib\application.js:618:24)
at Object.<anonymous> (G:\Practice\code\15.使用express写接口.js:33:5)
at Module._compile (internal/modules/cjs/loader.js:1015:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1035:10)
at Module.load (internal/modules/cjs/loader.js:879:32)
at Function.Module._load (internal/modules/cjs/loader.js:724:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
Emitted 'error' event on Server instance at:
at emitErrorNT (net.js:1344:8)
at processTicksAndRejections (internal/process/task_queues.js:84:21) {
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