我正在尝试安装 gulp，当我写的时候npm install我遇到了这个问题：
npm ERR! code 1
npm ERR! path D:\www\wegrow\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: C:\Program Files (x86)\nodejs\node.exe D:\www\wegrow\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 'C:\\Program Files (x86)\\nodejs\\node.exe',
npm ERR! gyp verb cli 'D:\\www\\wegrow\\node_modules\\node-gyp\\bin\\node-gyp.js',
npm ERR! gyp verb cli 'rebuild',
npm ERR! gyp verb …