npm install 报错 -----Cannot download "node-sass”

node scripts/install.js
Cannot download "https://github.com/sass/node-sass/releases/download/v3.8.0/win32-x64-48_binding.node"
----------------
gyp info it worked if it ends with ok
gyp verb cli [ 'D:\\azml\\nodejs\\node.exe',
gyp verb cli   'E:\\test\\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 [email protected]
gyp info using [email protected] | 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
--------------------- 

查找原因----------主要是windows平台缺少编译环境

1.npm install -g node-gyp 

2.npm install --global --production windows-build-tools 

报错：The build tools cannot be installed without administrative rights.To fix, right-click on PowerShell and run "as Administrator".

进入PowerShell以管理员身份运行上面代码

3.npm uninstall node-sass

4.npm install node-sass

npm install