wq

MongoError: failed to connect to server [localhost:27017] on first connect [Mong oError: connect ECONNREFUSED 127.0.0.1:27017] at Pool. (D:\2020\vue后台管理\node-elm\node_modules\_mongodb-core @2.1.20@mongodb-core\lib\topologies\server.js:336:35) at Pool.emit (events.js:198:13) at Connection. (D:\2020\vue后台管理\node-elm\node_modules\_mongod [email protected]@mongodb-core\lib\connection\pool.js:280:12) at Object.onceWrapper (events.js:286:20) at...

$sse报错，也没有vue3的使用例子