“npm config set registry https://registry.npmjs.org/” is not working in windows bat file

Question

I create a.bat on windows 7, the content of a.bat is:

@echo off
npm config set registry https://registry.npmjs.org/

and then run a.bat, but

Answer 1

We can also run npm install with registry options for multiple custom registry URLs.

npm install --registry=https://registry.npmjs.org/ 
npm install --registry=https://custom.npm.registry.com/