npm start后terminal会不正常的一直刷

[JackieZhang-Coding]

启动后，terminal会不停的刷，不知道是什么问题。

[jinpengqiong]

一样的一直刷新报错
errorLabels: [ 'TransientTransactionError' ],
[Symbol(mongoErrorContextSymbol)]: {}
}
(node:39889) UnhandledPromiseRejectionWarning: MongoNetworkError: failed to connect to server [localhost:27017] on first connect [Error: connect ECONNREFUSED 127.0.0.1:27017
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:16) {
name: 'MongoNetworkError',
errorLabels: [Array],
[Symbol(mongoErrorContextSymbol)]: {}
}]
at Pool. (/Users/admin/Desktop/GraphQL-demo/node_modules/mongodb/lib/core/topologies/server.js:433:11)
at Pool.emit (events.js:376:20)
at /Users/admin/Desktop/GraphQL-demo/node_modules/mongodb/lib/core/connection/pool.js:562:14
at /Users/admin/Desktop/GraphQL-demo/node_modules/mongodb/lib/core/connection/pool.js:985:11
at /Users/admin/Desktop/GraphQL-demo/node_modules/mongodb/lib/core/connection/connect.js:40:11
at callback (/Users/admin/Desktop/GraphQL-demo/node_modules/mongodb/lib/core/connection/connect.js:262:5)
at Socket. (/Users/admin/Desktop/GraphQL-demo/node_modules/mongodb/lib/core/connection/connect.js:287:7)
at Object.onceWrapper (events.js:483:26)
at Socket.emit (events.js:376:20)
at emitErrorNT (internal/streams/destroy.js:106:8)
at emitErrorCloseNT (internal/streams/destroy.js:74:3)
at processTicksAndRejections (internal/process/task_queues.js:82:21)
(node:39889) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 516)

[binghong-chen]

需要mongodb环境