什么是process.env

Question

Where can I get the documentation for process.env ?

Wat all the variables I can access in that env

For example, what does process.env.port || 1137 process.env.port || 1137 do?

I understand process.env is environment and we are looking for port in it. what does || mean?

Answer 1

This is a common notation in JavaScript that allows for default values, typically for user provided options, if none are given.

If process.env.port has a value, it is used. If it doesn't have a value, then 1137 will be used.

Answer 2

if process.env.port exist it will use it otherwise it will use 1137. || it is or operator.