关于vue使用 npm run dev报错原因

> my-project@0.1.0 dev D:\my-project
> webpack-dev-server --inline --progress --config build/webpack.dev.conf.js

internal/modules/cjs/loader.js:796
    throw err;
    ^

Error: Cannot find module 'D:\my-project\build\webpack.dev.conf.js'
Require stack:
- D:\my-project\node_modules\webpack-cli\bin\utils\convert-argv.js
- D:\my-project\node_modules\webpack-dev-server\bin\webpack-dev-server.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:793:17)
    at Function.Module._load (internal/modules/cjs/loader.js:686:27)
    at Module.require (internal/modules/cjs/loader.js:848:19)
    at require (internal/modules/cjs/helpers.js:74:18)
    at WEBPACK_OPTIONS (D:\my-project\node_modules\webpack-cli\bin\utils\convert-argv.js:114:13)
    at requireConfig (D:\my-project\node_modules\webpack-cli\bin\utils\convert-argv.js:116:6)
    at D:\my-project\node_modules\webpack-cli\bin\utils\convert-argv.js:123:17
    at Array.forEach (<anonymous>)
    at module.exports (D:\my-project\node_modules\webpack-cli\bin\utils\convert-argv.js:121:15)
    at Object.<anonymous> (D:\my-project\node_modules\webpack-dev-server\bin\webpack-dev-server.js:84:40) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    'D:\\my-project\\node_modules\\webpack-cli\\bin\\utils\\convert-argv.js',
    'D:\\my-project\\node_modules\\webpack-dev-server\\bin\\webpack-dev-server.js'
  ]
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! my-project@0.1.0 dev: `webpack-dev-server --inline --progress --config build/webpack.dev.conf.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the my-project@0.1.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Administrator\AppData\Roaming\npm-cache\_logs\2020-02-14T13_27_31_418Z-debug.log

打开package.js文件夹如下：

{
  "name": "my-project",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },
  "dependencies": {
    "core-js": "^3.6.4",
    "vue": "^2.6.11",
    "webpack-cli": "^3.3.10"
  },
  "devDependencies": {
    "@vue/cli-plugin-babel": "~4.2.0",
    "@vue/cli-plugin-eslint": "~4.2.0",
    "@vue/cli-service": "~4.2.0",
    "babel-eslint": "^10.0.3",
    "eslint": "^6.7.2",
    "eslint-plugin-vue": "^6.1.2",
    "vue-template-compiler": "^2.6.11"
  },
  "eslintConfig": {
    "root": true,
    "env": {
      "node": true
    },
    "extends": [
      "plugin:vue/essential",
      "eslint:recommended"
    ],
    "parserOptions": {
      "parser": "babel-eslint"
    },
    "rules": {}
  },
  "browserslist": [
    "> 1%",
    "last 2 versions"
  ]
}

发现vue 给咱们提供的启动方式为serve

于是找到问题所在运行 npm run serve  果然运行成功 如图：