Pass or use process.env variable from node to reactjs

问题

How do I pass or use process.env variables from node to reactjs? For example I have this

const nodeEnv = process.env.NODE_ENV || 'development'

in my development and it works (I think because it's development and I DO have a fallback 'development'.

But when we push it to our staging server and set NODE_ENV variable, it only works the first time it loads but subsequently it doesn't. I think I do get this because at first it's served by node and it has access to server variables but afterwards it would be reactjs serving the pages (right?) and it wouldn't have access to server stuff. So how do I get to have variables to reactjs without hardcoding it (because we would eventually have a different set for production)?

EDIT. We also use webpack if that has a difference.

回答1:

I found this: http://dev.topheman.com/make-your-react-production-minified-version-with-webpack/

module.exports = {
  //...
  plugins:[
    new webpack.DefinePlugin({
      'process.env':{
        'NODE_ENV': JSON.stringify('production')
      }
    }),
    // [...]
  ]
  //...
}

In my opinion this is exactly what you are searching for.

回答2:

Webpack also has defined EnvironmentPlugin for this. Just provide an array of environment variable names and they'll be accessible in the client.

plugins: [
  new webpack.EnvironmentPlugin([
    'NODE_ENV',
     'SOME_OTHER_KEY'
  ])
]

来源：https://stackoverflow.com/questions/36760897/pass-or-use-process-env-variable-from-node-to-reactjs