1、报错问题
 1 E:\WebStormFile\treehole-manage>npm run dev

 > xc-ui-pc-sysmanage@1.0.0 dev E:\WebStormFile\treehole-manage

 > webpack-dev-server --inline --progress --config build/webpack.dev.conf.js

  94% asset optimization

  ERROR  Failed to compile with 2 errors                                                                09:51:14

  error  in ./src/base/components/head.vue

 Module build failed: Error: Cannot find module 'node-sass'

     at Function.Module._resolveFilename (module.js:547:15)

     at Function.Module._load (module.js:474:25)

     at Module.require (module.js:596:17)

     at require (internal/module.js:11:18)

     at Object.<anonymous> (E:\WebStormFile\treehole-manage\node_modules\sass-loader\lib\loader.js:3:14)

     at Module._compile (module.js:652:30)

     at Object.Module._extensions..js (module.js:663:10)

     at Module.load (module.js:565:32)

     at tryModuleLoad (module.js:505:12)

     at Function.Module._load (module.js:497:3)

     at Module.require (module.js:596:17)

     at require (internal/module.js:11:18)

     at loadLoader (E:\WebStormFile\treehole-manage\node_modules\loader-runner\lib\loadLoader.js:13:17)

     at iteratePitchingLoaders (E:\WebStormFile\treehole-manage\node_modules\loader-runner\lib\LoaderRunner.js:1

 69:2)

     at iteratePitchingLoaders (E:\WebStormFile\treehole-manage\node_modules\loader-runner\lib\LoaderRunner.js:1

 65:10)

     at E:\WebStormFile\treehole-manage\node_modules\loader-runner\lib\LoaderRunner.js:173:18

  @ ./node_modules/vue-style-loader!./node_modules/css-loader?{"sourceMap":false}!./node_modules/vue-loader/lib/

 style-compiler?{"vue":true,"id":"data-v-1340bee1","scoped":true,"hasInlineConfig":false}!./node_modules/sass-lo

 ader/lib/loader.js?{"sourceMap":false}!./node_modules/vue-loader/lib/selector.js?type=styles&index=0&bustCache!

 ./src/base/components/head.vue 4:14-395 13:3-17:5 14:22-403

  @ ./src/base/components/head.vue

  @ ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0&bustCache!./sr

 c/module/home/page/home.vue

  @ ./src/module/home/page/home.vue

  @ ./src/module/home/router/index.js

  @ ./src/base/router/index.js

  @ ./src/main.js

  @ multi (webpack)-dev-server/client?http://localhost:11001 webpack/hot/dev-server ./src/main.js

2、解决过程

1）使用命令“npm install node-sass --save-dev”下载一个新的 “node-sass”文件
“Module build failed: Error: Cannot find module 'node-sass'”的意思是找不到模块的‘node-sass’文件，所以你要做的是去下载一个‘node-sass’文件，好吧，报错了。仔细看了一下，并借鉴 https://blog.csdn.net/qq_38401285/article/details/86483278 这个博主踩的坑，然后我直接做了第二步。

E:\WebStormFile\treehole-manage>npm install node-sass --save-dev

npm ERR! code ECONNREFUSED

npm ERR! errno ECONNREFUSED

npm ERR! FetchError: request to https://registry.npm.taobao.org/node-sass failed, reason: connect ECONNREFUSED 127.0.0.1:1080

npm ERR!     at ClientRequest.req.on.err (E:\WebStormFile\treehole-manage\node_modules\npm\node_modules\pacote\node_modules\make-fetch-happen\node_mo

.......

npm ERR!     at <anonymous>

npm ERR!     at process._tickCallback (internal/process/next_tick.js:188:7)

npm ERR!   message: 'request to https://registry.npm.taobao.org/node-sass failed, reason: connect ECONNREFUSED 127.0.0.1:1080',

npm ERR!   type: 'system',

npm ERR!   errno: 'ECONNREFUSED',

npm ERR!   code: 'ECONNREFUSED',

npm ERR!   stack: 'FetchError: request to https://registry.npm.taobao.org/node-sass failed, reason: connect ECONNREFUSED 127.0.0.1:1080\n    at Clien

.......

npm ERR!

npm ERR! If you are behind a proxy, please make sure that the npm ERR! 'proxy' config is set properly.  See: 'npm help config'
+++》意思大概是 如果你在一个代理后面，请确保npm出错了代理服务器的配置设置正确。

.......

2）npm配置使用淘宝镜像 ‘npm config set registry http://registry.npm.taobao.org’

3）cnpm install node-sass --save，使用cnpm重新下载‘node-sass’文件

4）npm run dev ，重新运行项目。