Shared WebWorker Example

index.html

<script>

var url = 'shared-webworker.js';
var worker = new SharedWorker(url);

console.log('Using shared worker at', url)

worker.port.addEventListener("message", function(e) {
	alert(e.data);
}, false);

worker.port.start();

</script>

shared-webworker.js

/**
 * Shared Web Worker
 * see: https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers
 * https://www.sitepoint.com/javascript-shared-web-workers-html5/
 */

var connections = 0;

self.addEventListener("connect", function (e) {

	var port = e.ports[0];
	connections++;

	port.postMessage("hello " + e.data + " (port #" + connections + ") " + JSON.stringify(port));

	port.addEventListener("message", function (e) {
		port.postMessage("Message " + e.data + " (port #" + connections + ")");
	}, false);

	port.start();

}, false);