Installing Nodejs under Windows How to set environment variables

Nodejs is installed under Windows, and NPM is installed, but sometimes it cannot be used directly with the request (' WS '). I think it's true. If there is a problem with the environment variable or other settings, can you give a complete Setup scenario:

To set two things, one is to add Node.exe directory on PATH C:\Program Files\nodejs, one is to increase the environment variable Node_path, the value is C:\Program files\nodejs\node_modules

Installing Nodejs under Windows How to set environment variables