Gulp is not an internal or external command or webpack is not an internal or external command

Gulp installation is also normal, but is the time to view gulp-v error, Reason: Missing system variable path or path variable wrong

Hint: This system variable path, directly append is good (multiple variable values with semicolons; separate), do not delete the existing system variable path

How do I find this variable? There are three ways to find, maybe there are other ways to find, you choose a preferred way (if it must be the global installation of gulp)

Keep a record of the methods you've used:

Enter in DOS

npm config get prefix

An address is displayed, which is the system variable path

Gulp is not an internal or external command or webpack is not an internal or external command