下载了vue2的脚手架工程：https://github.com/PanJiaChen/vue-admin-template

npm install的时候出现了异常： node-sass安装报错，缺少 Python2 环境

npm ERR! code 1
npm ERR! path D:\07_project_front\online_edu_front\node_modules\node-sass
npm ERR! command failed
npm ERR! command C:\WINDOWS\system32\cmd.exe /d /s /c node scripts/build.js
npm ERR! Building: D:\Program Files\nodejs\node.exe D:\07_project_front\online_edu_front\node_modules\node-gyp\bin\node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library=
npm ERR! gyp info it worked if it ends with ok
npm ERR! gyp verb cli [
npm ERR! gyp verb cli   'D:\\Program Files\\nodejs\\node.exe',
npm ERR! gyp verb cli   'D:\\07_project_front\\online_edu_front\\node_modules\\node-gyp\\bin\\node-gyp.js',
npm ERR! gyp verb cli   'rebuild',
npm ERR! gyp verb cli   '--verbose',
npm ERR! gyp verb cli   '--libsass_ext=',
npm ERR! gyp verb cli   '--libsass_cflags=',
npm ERR! gyp verb cli   '--libsass_ldflags=',
npm ERR! gyp verb cli   '--libsass_library='
npm ERR! gyp verb cli ]
npm ERR! gyp info using node-gyp@3.8.0
npm ERR! gyp info using node@16.14.2 | win32 | x64
npm ERR! gyp verb command rebuild []
npm ERR! gyp verb command clean []
npm ERR! gyp verb clean removing "build" directory
npm ERR! gyp verb command configure []
npm ERR! gyp verb check python checking for Python executable "python2" in the PATH
npm ERR! gyp verb `which` failed Error: not found: python2
npm ERR! gyp verb `which` failed     at getNotFoundError (D:\07_project_front\online_edu_front\node_modules\which\which.js:13:12)  
npm ERR! gyp verb `which` failed     at F (D:\07_project_front\online_edu_front\node_modules\which\which.js:68:19)
npm ERR! gyp verb `which` failed     at E (D:\07_project_front\online_edu_front\node_modules\which\which.js:80:29)
npm ERR! gyp verb `which` failed     at D:\07_project_front\online_edu_front\node_modules\which\which.js:89:16
npm ERR! gyp verb `which` failed     at D:\07_project_front\online_edu_front\node_modules\isexe\index.js:42:5
npm ERR! gyp verb `which` failed     at D:\07_project_front\online_edu_front\node_modules\isexe\windows.js:36:5
npm ERR! gyp verb `which` failed     at FSReqCallback.oncomplete (node:fs:198:21)
npm ERR! gyp verb `which` failed  python2 Error: not found: python2
npm ERR! gyp verb `which` failed     at getNotFoundError (D:\07_project_front\online_edu_front\node_modules\which\which.js:13:12)  
npm ERR! gyp verb `which` failed     at F (D:\07_project_front\online_edu_front\node_modules\which\which.js:68:19)
npm ERR! gyp verb `which` failed     at E (D:\07_project_front\online_edu_front\node_modules\which\which.js:80:29)
npm ERR! gyp verb `which` failed     at D:\07_project_front\online_edu_front\node_modules\which\which.js:89:16
npm ERR! gyp verb `which` failed     at D:\07_project_front\online_edu_front\node_modules\isexe\index.js:42:5
npm ERR! gyp verb `which` failed     at D:\07_project_front\online_edu_front\node_modules\isexe\windows.js:36:5
npm ERR! gyp verb `which` failed     at FSReqCallback.oncomplete (node:fs:198:21) {
npm ERR! gyp verb `which` failed   code: 'ENOENT'
npm ERR! gyp verb `which` failed }
npm ERR! gyp verb check python checking for Python executable "python" in the PATH
npm ERR! gyp verb `which` succeeded python D:\Program Files (x86)\python\python.EXE
npm ERR! gyp ERR! configure error
npm ERR! gyp ERR! stack Error: Command failed: D:\Program Files (x86)\python\python.EXE -c import sys; print "%s.%s.%s" % sys.version_info[:3];
npm ERR! gyp ERR! stack   File "<string>", line 1
npm ERR! gyp ERR! stack     import sys; print "%s.%s.%s" % sys.version_info[:3];
npm ERR! gyp ERR! stack                       ^
npm ERR! gyp ERR! command "D:\\Program Files\\nodejs\\node.exe" "D:\\07_project_front\\online_edu_front\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
npm ERR! gyp ERR! cwd D:\07_project_front\online_edu_front\node_modules\node-sass
npm ERR! gyp ERR! node -v v16.14.2
npm ERR! gyp ERR! node-gyp -v v3.8.0
npm ERR! gyp ERR! not ok
npm ERR! Build failed with error code: 1
npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\xhh\AppData\Local\npm-cache\_logs\2022-11-22T08_06_47_369Z-debug-0.log

初步分析是缺少python2环境，安装后还是没用。

实际是 node-sass的版本太低了，更新至

"node-sass": "^6.0.1"

重新 npm install ，问题解决。