node app
var config = require('config'); // => 'development'
console.log(config.get('Wechat.redis')) // => { host: '192.168.40.52', port: 6379, db: 0 }
NODE_ENV=test node app
var config = require('config'); // => 'test'
console.log(config.get('Wechat.redis')) // => { host: '172.17.20.107', port: 39000, db: 0 }
NODE_ENV=production node app
var config = require('config'); // => 'production'
console.log(config.get('Wechat.redis')) // => { host: '172.17.20.88', port: 39000, db: 0 }