这是安装失败的报错：
C:Usersxuj20>npm install gulp-sass -g
> node-sass@4.5.2 install C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modules
ode-sass
> node scripts/install.js
Downloading binary from https://github.com/sass/node-sass/releases/download/v4.5.2/win32-x64-48_binding.node
Cannot download "https://github.com/sass/node-sass/releases/download/v4.5.2/win32-x64-48_binding.node":
connect ECONNREFUSED 127.0.0.1:443
Hint: If github.com is not accessible in your location
try setting a proxy via HTTP_PROXY, e.g.
export HTTP_PROXY=http://example.com:1234
or configure npm proxy via
npm config set proxy http://example.com:8080
> node-sass@4.5.2 postinstall C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modules
ode-sass
> node scripts/build.js
Building: D:
ode
ode.exe C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modules
ode-gypin
ode-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library=
gyp info it worked if it ends with ok
gyp verb cli [ 'D:\node\node.exe',
gyp verb cli 'C:\Users\xuj20\AppData\Roaming\npm\node_modules\gulp-sass\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@3.6.0
gyp info using node@6.10.2 | 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 (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:13:12)
gyp verb `which` failed at F (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:68:19)
gyp verb `which` failed at E (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:80:29)
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:89:16
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modulesisexeindex.js:42:5
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modulesisexewindows.js:36:5
gyp verb `which` failed at FSReqWrap.oncomplete (fs.js:123:15)
gyp verb `which` failed python2 { Error: not found: python2
gyp verb `which` failed at getNotFoundError (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:13:12)
gyp verb `which` failed at F (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:68:19)
gyp verb `which` failed at E (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:80:29)
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:89:16
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modulesisexeindex.js:42:5
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modulesisexewindows.js:36:5
gyp verb `which` failed at FSReqWrap.oncomplete (fs.js:123:15) 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 (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:13:12)
gyp verb `which` failed at F (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:68:19)
gyp verb `which` failed at E (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:80:29)
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:89:16
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modulesisexeindex.js:42:5
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modulesisexewindows.js:36:5
gyp verb `which` failed at FSReqWrap.oncomplete (fs.js:123:15)
gyp verb `which` failed python { Error: not found: python
gyp verb `which` failed at getNotFoundError (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:13:12)
gyp verb `which` failed at F (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:68:19)
gyp verb `which` failed at E (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:80:29)
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_moduleswhichwhich.js:89:16
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modulesisexeindex.js:42:5
gyp verb `which` failed at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modulesisexewindows.js:36:5
gyp verb `which` failed at FSReqWrap.oncomplete (fs.js:123:15) 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 Object.failNoPython (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modules
ode-gyplibconfigure.js:482:19)
gyp ERR! stack at Object.<anonymous> (C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modules
ode-gyplibconfigure.js:508:16)
gyp ERR! stack at C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modulesgraceful-fspolyfills.js:284:29
gyp ERR! stack at FSReqWrap.oncomplete (fs.js:123:15)
gyp ERR! System Windows_NT 10.0.15063
gyp ERR! command "D:\node\node.exe" "C:\Users\xuj20\AppData\Roaming\npm\node_modules\gulp-sass\node_modules\node-gyp\bin\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd C:Usersxuj20AppDataRoaming
pm
ode_modulesgulp-sass
ode_modules
ode-sass
gyp ERR! node -v v6.10.2
gyp ERR! node-gyp -v v3.6.0
gyp ERR! not ok
Build failed with error code: 1
C:Usersxuj20AppDataRoaming
pm
`-- (empty)
npm ERR! Windows_NT 10.0.15063
npm ERR! argv "D:\node\node.exe" "D:\node\node_modules\npm\bin\npm-cli.js" "install" "gulp-sass" "-g"
npm ERR! node v6.10.2
npm ERR! npm v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! node-sass@4.5.2 postinstall: `node scripts/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the node-sass@4.5.2 postinstall script 'node scripts/build.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the node-sass package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node scripts/build.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs node-sass
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls node-sass
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! C:Usersxuj20
pm-debug.log
npm ERR! code 1看了一下，好像是缺少python环境，但是我也已经下载安装了python;求助，需要怎么做？
