Error: connect ECONNREFUSED ::1:3000

[wmy0320]

in my viteset project, i'm using the mockjs to mock request url. But when running the project, error occurs,

Error: Error: connect ECONNREFUSED ::1:3000
    at Object.dispatchError (D:\auto-test\web-tenant\node_modules\jsdom\lib\jsdom\living\19)
    at Request.<anonymous> (D:\auto-test\web-tenant\node_modules\jsdom\lib\jsdom\living\xpl.js:655:18)
    at Request.emit (node:events:525:35)
    at ClientRequest.<anonymous> (D:\auto-test\web-tenant\node_modules\jsdom\lib\jsdom\liquest.js:127:14)
    at ClientRequest.emit (node:events:513:28)
    at Socket.socketErrorListener (node:_http_client:502:9)
    at Socket.emit (node:events:513:28)
    at emitErrorNT (node:internal/streams/destroy:151:8)
    at emitErrorCloseNT (node:internal/streams/destroy:116:3)
    at processTicksAndRejections (node:internal/process/task_queues:82:21) undefined

i m very curious where the port 3000 comes from
By the way , i have used the 'cross-fetch', but it doesn't work for me