这里用插件去链接数据库总是连不上，一直报错。

来源：6-6 使用Node链接MongoDB

Aioros2017

2022-11-14

(node:53089) UnhandledPromiseRejectionWarning: MongoServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017
at Timeout._onTimeout (/Users/lixiang/工作/GitHub/node/mongodb/node_modules/_mongodb@4.11.0@mongodb/lib/sdam/topology.js:293:38)
at listOnTimeout (internal/timers.js:555:17)
at processTimers (internal/timers.js:498:7)
(Use node --trace-warnings ... to show where the warning was created)
(node:53089) 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: 1)
(node:53089) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

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