由于重新装了一个系统，很多环境配置要重新配置。在想run 一个项目时，出现下面的错误：
error in ./src/page/Index.vue Module build failed: Error: Cannot find module 'node-sass' at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15) at Function.Module._load (internal/modules/cjs/loader.js:507:25) at Module.require (internal/modules/cjs/loader.js:637:17) at require (internal/modules/cjs/helpers.js:22:18) at Object.sassLoader (E: rip_user_ui ode_modulessass-loaderlibloader.js:46:72) @ ./node_modules/vue-style-loader!./node_modules/css-loader?{"sourceMap":false}!./node_modules/vue-loader/lib/style-compiler?{"vue":true,"id":"data-v-c221866a"," scoped":true,"hasInlineConfig":false}!./node_modules/sass-loader/lib/loader.js?{"sourceMap":false}!./node_modules/vux-loader/src/style-loader.js!./node_modules/vu e-loader/lib/selector.js?type=styles&index=0!./src/page/Index.vue 4:14-424 13:3-17:5 14:22-432 @ ./src/page/Index.vue @ ./src/router/index.js @ ./src/main.js @ multi (webpack)-dev-server/client?http://0.0.0.0:8080 webpack/hot/dev-server ./src/main.js error in ./src/page/addPerson.vue Module build failed: Error: Cannot find module 'node-sass' at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15) at Function.Module._load (internal/modules/cjs/loader.js:507:25) at Module.require (internal/modules/cjs/loader.js:637:17) at require (internal/modules/cjs/helpers.js:22:18) at Object.sassLoader (E: rip_user_ui ode_modulessass-loaderlibloader.js:46:72) @ ./node_modules/vue-style-loader!./node_modules/css-loader?{"sourceMap":false}!./node_modules/vue-loader/lib/style-compiler?{"vue":true,"id":"data-v-485da622"," scoped":true,"hasInlineConfig":false}!./node_modules/sass-loader/lib/loader.js?{"sourceMap":false}!./node_modules/vux-loader/src/style-loader.js!./node_modules/vu e-loader/lib/selector.js?type=styles&index=0!./src/page/addPerson.vue 4:14-428 13:3-17:5 14:22-436 @ ./src/page/addPerson.vue @ ./src/router/index.js @ ./src/main.js @ multi (webpack)-dev-server/client?http://0.0.0.0:8080 webpack/hot/dev-server ./src/main.js error in ./src/page/callPolice.vue Module build failed: Error: Cannot find module 'node-sass' at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15) at Function.Module._load (internal/modules/cjs/loader.js:507:25) at Module.require (internal/modules/cjs/loader.js:637:17) at require (internal/modules/cjs/helpers.js:22:18) at Object.sassLoader (E: rip_user_ui ode_modulessass-loaderlibloader.js:46:72) @ ./node_modules/vue-style-loader!./node_modules/css-loader?{"sourceMap":false}!./node_modules/vue-loader/lib/style-compiler?{"vue":true,"id":"data-v-31d77fd3"," scoped":true,"hasInlineConfig":false}!./node_modules/sass-loader/lib/loader.js?{"sourceMap":false}!./node_modules/vux-loader/src/style-loader.js!./node_modules/vu e-loader/lib/selector.js?type=styles&index=0!./src/page/callPolice.vue 4:14-429 13:3-17:5 14:22-437 @ ./src/page/callPolice.vue @ ./src/router/index.js @ ./src/main.js @ multi (webpack)-dev-server/client?http://0.0.0.0:8080 webpack/hot/dev-server ./src/main.js error in ./src/page/passenger.vue Module build failed: Error: Cannot find module 'node-sass' at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15) at Function.Module._load (internal/modules/cjs/loader.js:507:25) at Module.require (internal/modules/cjs/loader.js:637:17) at require (internal/modules/cjs/helpers.js:22:18) at Object.sassLoader (E: rip_user_ui ode_modulessass-loaderlibloader.js:46:72) @ ./node_modules/vue-style-loader!./node_modules/css-loader?{"sourceMap":false}!./node_modules/vue-loader/lib/style-compiler?{"vue":true,"id":"data-v-9a9a079a"," scoped":true,"hasInlineConfig":false}!./node_modules/sass-loader/lib/loader.js?{"sourceMap":false}!./node_modules/vux-loader/src/style-loader.js!./node_modules/vu e-loader/lib/selector.js?type=styles&index=0!./src/page/passenger.vue 4:14-428 13:3-17:5 14:22-436 @ ./src/page/passenger.vue @ ./src/router/index.js @ ./src/main.js @ multi (webpack)-dev-server/client?http://0.0.0.0:8080 webpack/hot/dev-server ./src/main.js 然后报错说是找不到node-sass，那么想着install一个node-sass就行了。但是发现结果不是！！！输入命令npm install node-sass --save-dev
报错如下：
gyp info it worked if it ends with ok gyp verb cli [ 'C:\Program Files\nodejs\node.exe', gyp verb cli 'E:\trip_user_ui\node_modules\node-gyp\bin\node-gyp.js', gyp verb cli 'rebuild', gyp verb cli '--verbose', gyp verb cli '--libsass_ext=', gyp verb cli '--libsass_cflags=', gyp verb cli '--libsass_ldflags=', gyp verb cli '--libsass_library=' ] gyp info using node-gyp@3.8.0 gyp info using node@10.15.0 | win32 | x64 gyp verb command rebuild [] gyp verb command clean [] gyp verb clean removing "build" directory gyp verb command configure [] gyp verb check python checking for Python executable "python2" in the PATH gyp verb `which` failed Error: not found: python2 gyp verb `which` failed at getNotFoundError (E: rip_user_ui ode_moduleswhichwhich.js:13:12) gyp verb `which` failed at F (E: rip_user_ui ode_moduleswhichwhich.js:68:19) gyp verb `which` failed at E (E: rip_user_ui ode_moduleswhichwhich.js:80:29) gyp verb `which` failed at E: rip_user_ui ode_moduleswhichwhich.js:89:16 gyp verb `which` failed at E: rip_user_ui ode_modulesisexeindex.js:42:5 gyp verb `which` failed at E: rip_user_ui ode_modulesisexewindows.js:36:5 gyp verb `which` failed at FSReqWrap.oncomplete (fs.js:154:21) gyp verb `which` failed python2 { Error: not found: python2 gyp verb `which` failed at getNotFoundError (E: rip_user_ui ode_moduleswhichwhich.js:13:12) gyp verb `which` failed at F (E: rip_user_ui ode_moduleswhichwhich.js:68:19) gyp verb `which` failed at E (E: rip_user_ui ode_moduleswhichwhich.js:80:29) gyp verb `which` failed at E: rip_user_ui ode_moduleswhichwhich.js:89:16 gyp verb `which` failed at E: rip_user_ui ode_modulesisexeindex.js:42:5 gyp verb `which` failed at E: rip_user_ui ode_modulesisexewindows.js:36:5 gyp verb `which` failed at FSReqWrap.oncomplete (fs.js:154:21) gyp verb `which` failed stack: gyp verb `which` failed 'Error: not found: python2 at getNotFoundError (E:\trip_user_ui\node_modules\which\which.js:13:12) at F (E:\trip_user_ui \node_modules\which\which.js:68:19) at E (E:\trip_user_ui\node_modules\which\which.js:80:29) at E:\trip_user_ui\node_modules\which\which.js:8 9:16 at E:\trip_user_ui\node_modules\isexe\index.js:42:5 at E:\trip_user_ui\node_modules\isexe\windows.js:36:5 at FSReqWrap.oncomplete (fs. js:154:21)', gyp verb `which` failed code: 'ENOENT' } gyp verb check python checking for Python executable "python" in the PATH gyp verb `which` failed Error: not found: python gyp verb `which` failed at getNotFoundError (E: rip_user_ui ode_moduleswhichwhich.js:13:12) gyp verb `which` failed at F (E: rip_user_ui ode_moduleswhichwhich.js:68:19) gyp verb `which` failed at E (E: rip_user_ui ode_moduleswhichwhich.js:80:29) gyp verb `which` failed at E: rip_user_ui ode_moduleswhichwhich.js:89:16 gyp verb `which` failed at E: rip_user_ui ode_modulesisexeindex.js:42:5 gyp verb `which` failed at E: rip_user_ui ode_modulesisexewindows.js:36:5 gyp verb `which` failed at FSReqWrap.oncomplete (fs.js:154:21) gyp verb `which` failed python { Error: not found: python gyp verb `which` failed at getNotFoundError (E: rip_user_ui ode_moduleswhichwhich.js:13:12) gyp verb `which` failed at F (E: rip_user_ui ode_moduleswhichwhich.js:68:19) gyp verb `which` failed at E (E: rip_user_ui ode_moduleswhichwhich.js:80:29) gyp verb `which` failed at E: rip_user_ui ode_moduleswhichwhich.js:89:16 gyp verb `which` failed at E: rip_user_ui ode_modulesisexeindex.js:42:5 gyp verb `which` failed at E: rip_user_ui ode_modulesisexewindows.js:36:5 gyp verb `which` failed at FSReqWrap.oncomplete (fs.js:154:21) gyp verb `which` failed stack: gyp verb `which` failed 'Error: not found: python at getNotFoundError (E:\trip_user_ui\node_modules\which\which.js:13:12) at F (E:\trip_user_ui ode_modules\which\which.js:68:19) at E (E:\trip_user_ui\node_modules\which\which.js:80:29) at E:\trip_user_ui\node_modules\which\which.js:89 :16 at E:\trip_user_ui\node_modules\isexe\index.js:42:5 at E:\trip_user_ui\node_modules\isexe\windows.js:36:5 at FSReqWrap.oncomplete (fs.j s:154:21)', gyp verb `which` failed code: 'ENOENT' } gyp verb could not find "python". checking python launcher gyp verb could not find "python". guessing location gyp verb ensuring that file exists: C:Python27python.exe gyp ERR! configure error gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable. gyp ERR! stack at PythonFinder.failNoPython (E: rip_user_ui ode_modules ode-gyplibconfigure.js:484:19) gyp ERR! stack at PythonFinder.<anonymous> (E: rip_user_ui ode_modules ode-gyplibconfigure.js:509:16) gyp ERR! stack at E: rip_user_ui ode_modulesgraceful-fspolyfills.js:282:31 gyp ERR! stack at FSReqWrap.oncomplete (fs.js:154:21) gyp ERR! System Windows_NT 10.0.16299 gyp ERR! command "C:\Program Files\nodejs\node.exe" "E:\trip_user_ui\node_modules\node-gyp\bin\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libs ass_cflags=" "--libsass_ldflags=" "--libsass_library=" gyp ERR! cwd E: rip_user_ui ode_modules ode-sass gyp ERR! node -v v10.15.0 gyp ERR! node-gyp -v v3.8.0 gyp ERR! not ok Build failed with error code: 1 npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modulesfsevents): npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"}) npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! node-sass@4.10.0 postinstall: `node scripts/build.js` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the node-sass@4.10.0 postinstall 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:UserszsmAppDataRoaming pm-cache\_logs2019-01-14T11_48_54_017Z-debug.log
先前npm install 也是报这种类似的错误。
后来搜索出cnpm install node-sass --save
这个命令可能有用，但是要事先安装cnpm。所以npm i cnpm时又是一通报错。
所以用npm install -g cnpm --registry=https://registry.npm.taobao.org ，从淘宝镜像那下载，然后cnpm下载成功。
最后输入cnpm install node-sass --save。npm run dev终于能跑起来了！！！