Module build failed: Error: Cannot find module 'node-sass'报错问题
由于项目需要，需要安装node-sass模块，便如一般时使用npm安装node-sass模块：
npm install node-sass --save
但是报出如下错误：
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. (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
出现以上原因是因为node-sass被墙了，无法安装，因此需要安装国内的镜像安装下载：
一般使用的国内的淘宝的镜像npm install -g cnpm --registry=https://registry.npm.taobao.org
在使用了国内淘宝镜像之后，就可以使用cnpm安装下载node-sass了：
cnpm install node-sass --save
安装好node-sass正常之后，就能使用npm run dev命令正常运行项目了。
可以查看我的另一个解决node-sass尚不支持您当前的环境问题的博客：https://blog.csdn.net/aspire_cj/article/details/105469554
以上、便是使用国内淘宝镜像下载安装node-sass解决问题的方法。
作者：aspire_cj
