MessageEvent.data

The data read-only property of the MessageEvent interface represents the data sent by the message emitter.

var data = messageEvent.data;

The data sent by the message emitter; this can be any data type.

myWorker.onmessage = function(e) {
  result.textContent = e.data;
  console.log('Message received from worker');
};

• ExtendableMessageEvent — similar to this interface but used in interfaces that needs to give more flexibility to authors.