main.js

var pubnub = PUBNUB.init({
  publish_key   : '<PUBLISH_KEY>',
  subscribe_key : '<SUBSCRIBE_KEY>'
})

pubnub.subscribe({
  channel : "my_channel",
  message : function (message) {
    console.log("I got the message: " + message)
  },
  connect : function () {
    pubnub.publish({
      channel : "my_channel",
      message : "Hello World!"
    })
  }
})