Worker()

The Worker() constructor creates a Worker object that executes the script at the specified URL. This script must obey the same-origin policy.

If the URL has an invalid syntax or if the same-origin policy is violated a DOMException of type SECURITY_ERR is thrown.

Note: that there is a disagreement among browser manufacturers about whether a data URI is of the same origin or not. Though Gecko 10.0 (Firefox 10.0 / Thunderbird 10.0 / SeaMonkey 2.7) and later accept data URIs, that's not the case in all other browsers.

Syntax

var myWorker = new Worker("aURL");

Arguments

aURL: Is a DOMString representing the URL of the script the worker will execute. It must obey the same-origin policy.

Example

The following code snippet shows creation of a Worker object using the Worker() constructor and subsequent usage of the object:

var myWorker = new Worker("worker.js");

first.onchange = function() {
  myWorker.postMessage([first.value,second.value]);
  console.log('Message posted to worker');
}

For a full example, see ourBasic dedicated worker example (run dedicated worker).

Specifications

Specification	Status	Comment
WHATWG HTML Living Standard The definition of 'Worker()' in that specification.	Living Standard	No change from Web Workers.
Web Workers The definition of 'Worker()' in that specification.	Editor's Draft	Initial definition.

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	4	3.5	10.0	10.6	4

Feature	Android	Firefox Mobile (Gecko)	Firefox OS (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	4.4	3.5	1.0.1	10.0	11.5	5.1