nodejs，NODE_ENV = production和导出NODE_ENV = production有什么区别？

Question

in package.json :

we can use like this:

{
   "build": "NODE_ENV=production && webpack -p"
}

But, in build.sh :

it must be:

export NODE_ENV=production
../../node_modules/.bin/webpack -p

if you use

NODE_ENV=production
../../node_modules/.bin/webpack -p

you will get undefined for process.env.NODE_ENV .

why?

Answer 1

export NODE_ENV=production

export command is for saving a NODE_ENV to your env, so Node.js will find out all your node env.

but bash script is doesn't recognise the NODE_ENV=production

.sh files is for bash script. CMIIW