求助，vue安装node-sass报错

第一步安装
npm install –save-dev sass-loader
这个是正常运行的

第二步
安装
npm install –save-dev node-sass
这个的时候 报错
E:\demo\one>npm install –save-dev node-sass
npm WARN prefer global node-gyp@3.8.0 should be installed with -g

node-sass@4.9.2 install E:\demo\one\node_modules\node-sass
node scripts/install.js

Downloading binary from https://github.com/sass/node-sass/releases/download/v4.9.2/win32-x64-48_binding.node
Cannot download “https://github.com/sass/node-sass/releases/download/v4.9.2/win32-x64-48_binding.node“:

ESOCKETTIMEDOUT

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@4.9.2 postinstall E:\demo\one\node_modules\node-sass
node scripts/build.js

Building: D:\Program Files\node.exe E:\demo\one\node_modules\node-gyp\bin\node-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:\Program Files\node.exe’,
gyp verb cli ‘E:\demo\one\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@6.2.0 | 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:\demo\one\node_modules\which\which.js:13:12)
gyp verb which failed at F (E:\demo\one\node_modules\which\which.js:68:19)
gyp verb which failed at E (E:\demo\one\node_modules\which\which.js:80:29)
gyp verb which failed at E:\demo\one\node_modules\which\which.js:89:16
gyp verb which failed at E:\demo\one\node_modules\isexe\index.js:42:5
gyp verb which failed at E:\demo\one\node_modules\isexe\windows.js:36:5
gyp verb which failed at FSReqWrap.oncomplete (fs.js:117:15)
gyp verb which failed python2 { Error: not found: python2
gyp verb which failed at getNotFoundError (E:\demo\one\node_modules\which\which.js:13:12)
gyp verb which failed at F (E:\demo\one\node_modules\which\which.js:68:19)
gyp verb which failed at E (E:\demo\one\node_modules\which\which.js:80:29)
gyp verb which failed at E:\demo\one\node_modules\which\which.js:89:16
gyp verb which failed at E:\demo\one\node_modules\isexe\index.js:42:5
gyp verb which failed at E:\demo\one\node_modules\isexe\windows.js:36:5
gyp verb which failed at FSReqWrap.oncomplete (fs.js:117:15)
gyp verb which failed stack: ‘Error: not found: python2\n at getNotFoundError (E:\demo\one\node_modules\which\which.js:13:12)\n at F (E:\demo\one\node_modules\which\which.js:68:19)\n at E (E:\demo\one\node_modules\which\which.js:80:29)\n at E:\demo\one\node_modules\which\which.js:89:16\n at E:\demo\one\node_modules\isexe\index.js:42:5\n at E:\demo\one\node_modules\isexe\windows.js:36:5\n at FSReqWrap.oncomplete (fs.js:117:15)’,
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:\demo\one\node_modules\which\which.js:13:12)
gyp verb which failed at F (E:\demo\one\node_modules\which\which.js:68:19)
gyp verb which failed at E (E:\demo\one\node_modules\which\which.js:80:29)
gyp verb which failed at E:\demo\one\node_modules\which\which.js:89:16
gyp verb which failed at E:\demo\one\node_modules\isexe\index.js:42:5
gyp verb which failed at E:\demo\one\node_modules\isexe\windows.js:36:5
gyp verb which failed at FSReqWrap.oncomplete (fs.js:117:15)
gyp verb which failed python { Error: not found: python
gyp verb which failed at getNotFoundError (E:\demo\one\node_modules\which\which.js:13:12)
gyp verb which failed at F (E:\demo\one\node_modules\which\which.js:68:19)
gyp verb which failed at E (E:\demo\one\node_modules\which\which.js:80:29)
gyp verb which failed at E:\demo\one\node_modules\which\which.js:89:16
gyp verb which failed at E:\demo\one\node_modules\isexe\index.js:42:5
gyp verb which failed at E:\demo\one\node_modules\isexe\windows.js:36:5
gyp verb which failed at FSReqWrap.oncomplete (fs.js:117:15)
gyp verb which failed stack: ‘Error: not found: python\n at getNotFoundError (E:\demo\one\node_modules\which\which.js:13:12)\n at F (E:\demo\one\node_modules\which\which.js:68:19)\n at E (E:\demo\one\node_modules\which\which.js:80:29)\n at E:\demo\one\node_modules\which\which.js:89:16\n at E:\demo\one\node_modules\isexe\index.js:42:5\n at E:\demo\one\node_modules\isexe\windows.js:36:5\n at FSReqWrap.oncomplete (fs.js:117:15)’,
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 Object.failNoPython (E:\demo\one\node_modules\node-gyp\lib\configure.js:484:19)
gyp ERR! stack at Object. (E:\demo\one\node_modules\node-gyp\lib\configure.js:509:16)
gyp ERR! stack at E:\demo\one\node_modules\graceful-fs\polyfills.js:284:29
gyp ERR! stack at FSReqWrap.oncomplete (fs.js:117:15)
gyp ERR! System Windows_NT 10.0.17134
gyp ERR! command “D:\Program Files\node.exe” “E:\demo\one\node_modules\node-gyp\bin\node-gyp.js” “rebuild” “–verbose” “–libsass_ext=” “–libsass_cflags=” “–libsass_ldflags=” “–libsass_library=”
gyp ERR! cwd E:\demo\one\node_modules\node-sass
gyp ERR! node -v v6.2.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok
Build failed with error code: 1
npm WARN optional Skipping failed optional dependency /chokidar/fsevents:
npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.2.4
npm WARN ajv-keywords@3.2.0 requires a peer of ajv@^6.0.0 but none was installed.
npm ERR! Windows_NT 10.0.17134
npm ERR! argv “D:\Program Files\node.exe” “D:\Program Files\node_modules\npm\bin\npm-cli.js” “install” “–save-dev” “node-sass”
npm ERR! node v6.2.0
npm ERR! npm v3.8.9
npm ERR! code ELIFECYCLE

npm ERR! node-sass@4.9.2 postinstall: node scripts/build.js
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the node-sass@4.9.2 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! E:\demo\one\npm-debug.log

大神们，这是啥意思啊