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.
var myWorker = new Worker(aURL);
DOMString
representing the URL of the script the worker will execute. It must obey the same-origin policy.The created worker.
SecurityError
is raised if the document is not allowed to start workersNetworkError
is raised if the MIME type of one of the script is text/csv
, image/*
, video/*
, or audio/*
. It should always be text/javacript.
SyntaxError
is raised if aURL cannot be parsed.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).
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 |
The Worker
interface it belongs to.
© 2005–2017 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Worker/Worker