运行报错

[shecong]

PS E:\my\InitiationTest\vue2-elm-master\vue2-elm-master> npm run dev

[email protected] dev
cross-env NODE_ENV=online node build/dev-server.js

node:internal/modules/cjs/loader:959
throw err;
^

Error: Cannot find module 'express'
Require stack:

• E:\my\InitiationTest\vue2-elm-master\vue2-elm-master\build\dev-server.js
  at Function.Module._resolveFilename (node:internal/modules/cjs/loader:956:15)
  at Function.Module._load (node:internal/modules/cjs/loader:804:27)
  at Module.require (node:internal/modules/cjs/loader:1028:19)
  at require (node:internal/modules/cjs/helpers:102:18)
  at Object. (E:\my\InitiationTest\vue2-elm-master\vue2-elm-master\build\dev-server.js:4:15)
  at Module._compile (node:internal/modules/cjs/loader:1126:14)
  at Object.Module._extensions..js (node:internal/modules/cjs/loader:1180:10)
  at Module.load (node:internal/modules/cjs/loader:1004:32)
  at Function.Module._load (node:internal/modules/cjs/loader:839:12)
  at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
  'E:\my\InitiationTest\vue2-elm-master\vue2-elm-master\build\dev-server.js'
  ]
  }

[chenyang48671155]

没有express模块

[sumcater]

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