Ajax Web Worker

ajax_worker.js

var handleRequest = function(data) {
  postMessage(data)
}
 
addEventListener('message', function(e) {
  var xhr = new XMLHttpRequest
  xhr.open('GET', e.data)
  xhr.onreadystatechange = function(e) {
    if (xhr.readyState === 4 && xhr.status === 200) {
      handleRequest(xhr.responseText)
    }
  }
 
  xhr.send()
})

ajax_worker_jsonp.js

// Credit goes to @bdc, see http://sharedfil.es/web-workers-KSaG7cyXFe.html
var handleRequest = function(data) {
  postMessage(data)
}

addEventListener('message', function(e) {
  importScripts(e.data + "?callback=handleRequest")
})

scripts.js

// Standard Ajax request
var worker = new Worker('ajax_worker.js')
worker.postMessage('/your/ajax_request')
worker.addEventListener('message', function(e) {
  data = e.data
})

// JSONP Ajax request
var worker = new Worker('ajax_worker_jsonp.js')
worker.postMessage('http://domain.com/your/ajax_request')
worker.addEventListener('message', function(e) {
  data = e.data
})

How to use???