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

npm run dev报错 信息如下：

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:\trip_user_ui\node_modules\sass-loader\lib\loader.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:\trip_user_ui\node_modules\sass-loader\lib\loader.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:\trip_user_ui\node_modules\sass-loader\lib\loader.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:\trip_user_ui\node_modules\sass-loader\lib\loader.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

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:\trip_user_ui\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (E:\trip_user_ui\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (E:\trip_user_ui\node_modules\which\which.js:80:29)
gyp verb `which` failed     at E:\trip_user_ui\node_modules\which\which.js:89:16
gyp verb `which` failed     at E:\trip_user_ui\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at E:\trip_user_ui\node_modules\isexe\windows.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:\trip_user_ui\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (E:\trip_user_ui\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (E:\trip_user_ui\node_modules\which\which.js:80:29)
gyp verb `which` failed     at E:\trip_user_ui\node_modules\which\which.js:89:16
gyp verb `which` failed     at E:\trip_user_ui\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at E:\trip_user_ui\node_modules\isexe\windows.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\n    at getNotFoundError (E:\\trip_user_ui\\node_modules\\which\\which.js:13:12)\n    at F (E:\\trip_user_ui
\\node_modules\\which\\which.js:68:19)\n    at E (E:\\trip_user_ui\\node_modules\\which\\which.js:80:29)\n    at E:\\trip_user_ui\\node_modules\\which\\which.js:8
9:16\n    at E:\\trip_user_ui\\node_modules\\isexe\\index.js:42:5\n    at E:\\trip_user_ui\\node_modules\\isexe\\windows.js:36:5\n    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:\trip_user_ui\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (E:\trip_user_ui\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (E:\trip_user_ui\node_modules\which\which.js:80:29)
gyp verb `which` failed     at E:\trip_user_ui\node_modules\which\which.js:89:16
gyp verb `which` failed     at E:\trip_user_ui\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at E:\trip_user_ui\node_modules\isexe\windows.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:\trip_user_ui\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (E:\trip_user_ui\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (E:\trip_user_ui\node_modules\which\which.js:80:29)
gyp verb `which` failed     at E:\trip_user_ui\node_modules\which\which.js:89:16
gyp verb `which` failed     at E:\trip_user_ui\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at E:\trip_user_ui\node_modules\isexe\windows.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\n    at getNotFoundError (E:\\trip_user_ui\\node_modules\\which\\which.js:13:12)\n    at F (E:\\trip_user_ui\
\node_modules\\which\\which.js:68:19)\n    at E (E:\\trip_user_ui\\node_modules\\which\\which.js:80:29)\n    at E:\\trip_user_ui\\node_modules\\which\\which.js:89
:16\n    at E:\\trip_user_ui\\node_modules\\isexe\\index.js:42:5\n    at E:\\trip_user_ui\\node_modules\\isexe\\windows.js:36:5\n    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:\Python27\python.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:\trip_user_ui\node_modules\node-gyp\lib\configure.js:484:19)
gyp ERR! stack     at PythonFinder.<anonymous> (E:\trip_user_ui\node_modules\node-gyp\lib\configure.js:509:16)
gyp ERR! stack     at E:\trip_user_ui\node_modules\graceful-fs\polyfills.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:\trip_user_ui\node_modules\node-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_modules\fsevents):
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:\Users\zsm\AppData\Roaming\npm-cache\_logs\2019-01-14T11_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！！！