先安装cnpm后使用 cnpm i 安装包时卡顿然后强制结束下载后再次接着安装node_modules后报错error，启动项目时npm run serve报下面的错，
正确做法：如果强制中断下载后，应将node_modules删除后重新安装即可，安装结束后没有出现error说明成功
PS D:\code\DA_svn\pages\index> npm run serve
> dmpd@0.1.0 serve D:\code\DA_svn\pages\index
vue-cli-service serve
INFO Starting development server...
ERROR Error: Cannot find module 'webpack'
Require stack:
- D:\code\DA_svn\pages\index\node_modules\_webpack-dev-server@3.11.2@webpack-dev-server\lib\Server.js
- D:\code\DA_svn\pages\index\node_modules\_@vue_cli-service@3.12.1@@vue\cli-service\lib\commands\serve.js
- D:\code\DA_svn\pages\index\node_modules\_@vue_cli-service@3.12.1@@vue\cli-service\lib\Service.js
- D:\code\DA_svn\pages\index\node_modules\_@vue_cli-service@3.12.1@@vue\cli-service\bin\vue-cli-service.js
Error: Cannot find module 'webpack'
Require stack:
- D:\code\DA_svn\pages\index\node_modules\_webpack-dev-server@3.11.2@webpack-dev-server\lib\Server.js
- D:\code\DA_svn\pages\index\node_modules\_@vue_cli-service@3.12.1@@vue\cli-service\lib\commands\serve.js
- D:\code\DA_svn\pages\index\node_modules\_@vue_cli-service@3.12.1@@vue\cli-service\lib\Service.js
- D:\code\DA_svn\pages\index\node_modules\_@vue_cli-service@3.12.1@@vue\cli-service\bin\vue-cli-service.js
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:794:15)
at Function.Module._load (internal/modules/cjs/loader.js:687:27)
at Module.require (internal/modules/cjs/loader.js:849:19)
at require (internal/modules/cjs/helpers.js:74:18)
at Module._compile (internal/modules/cjs/loader.js:956:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
at Module.load (internal/modules/cjs/loader.js:812:32)
at Function.Module._load (internal/modules/cjs/loader.js:724:14)
at Module.require (internal/modules/cjs/loader.js:849:19)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! dmpd@0.1.0 serve: `vue-cli-service serve`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the dmpd@0.1.0 serve 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\pactera\AppData\Roaming\npm-cache\_logs\2021-03-09T00_59_46_004Z-debug.log