postman (a): Detailed use environment variables in the postman

First, define the environment variable

1. Add environment branch

   

2. Adding Environment Variables

   

3. Switching environment branch

   

4. Use a script to set environment variables

   

5. Set the set level variables

   

Second, the use of environment variables

Use of the form {{}} variable name reference environment variables.

NOTE: variables can be used in a URL, the request parameters, the request header, the request body anywhere.