Extend function prototype to run a function as a WebWorker

javascript_background_thread.js

Function.prototype.runOnBackgroundThread = function (aCallback) {
  var _blob = new Blob(['onmessage = '+this.toString()],{"type":"text/javascript"});
  var _worker = new Worker((webkitURL.createObjectURL || URL.createObjectURL)(_blob));
  _worker.onmessage = aCallback;
  _worker.postMessage();
}

var _test = function () {
  postMessage((1+1).toString());
}

_test.runOnBackgroundThread(function(e){
  alert(e.data);
});

Neat! Be sure to check that webkitURL and others exists before attempting to access methods like createObjectURL or it will throw an error.

doesn't work on iOS regardless both Worker, Blob, and webkitURL are there :-/