npm install py environment

npm install py environment
$ npm install --global --production windows-build-tools

$ npm install --global node-gyp


From
http://stackoverflow.com/questions/21365714/nodejs-error-installing-with-npm



no need Manually
npm install node-sass --sass_binary_site=http://cdn.npm.taobao.org/dist/node-sass
yarn add node-sass --sass_binary_site=http://cdn.npm.taobao.org/dist/node -sass
These two commands can go to taobao private server to download the


nohup command.

　　Purpose : run the command without hanging up.

　　Syntax: nohup Command [ Arg ... ] [ & ]