The DedicatedWorkerGlobalScope
object (the Worker
global scope) is accessible through the self
keyword. Some additional global functions, namespaces objects, and constructors, not typically associated with the worker global scope, but available on it, are listed in the JavaScript Reference. See also: Functions available to workers.
Properties
This interface inherits properties from the WorkerGlobalScope
interface, and its parent EventTarget
, and therefore implements properties from WindowTimers
, WindowBase64
, and WindowEventHandlers
.
Properties inherited from WorkerGlobalScope
WorkerGlobalScope.self
- Returns an object reference to the
DedicatedWorkerGlobalScope
object itself. WorkerGlobalScope.console
Read only- Returns the
Console
associated with the worker. WorkerGlobalScope.location
Read only- Returns the
WorkerLocation
associated with the worker.WorkerLocation
is a specific location object, mostly a subset of theLocation
for browsing scopes, but adapted to workers. WorkerGlobalScope.navigator
Read only- Returns the
WorkerNavigator
associated with the worker.WorkerNavigator
is a specific navigator object, mostly a subset of theNavigator
for browsing scopes, but adapted to workers. WorkerGlobalScope.performance
Read only- Returns the
Performance
object associated with the worker, which is a regular performance object, but with a subset of its properties and methods available.
Event handlers
This interface inherits event handlers from the WorkerGlobalScope
interface, and its parent EventTarget
, and therefore implements event handlers from WindowTimers
, WindowBase64
, and WindowEventHandlers
.
DedicatedWorkerGlobalScope.onmessage
- Is an
EventHandler
representing the code to be called when themessage
event is raised. These events are of typeMessageEvent
and will be called when the worker receives a message from the document that started it (i.e. from theWorker.postMessage
method.)
Methods
This interface inherits methods from the WorkerGlobalScope
interface, and its parent EventTarget
, and therefore implements methods from WindowTimers
, WindowBase64
, and WindowEventHandlers
.
DedicatedWorkerGlobalScope.postMessage
- Sends a message — which can consist of
any
JavaScript object — to the parent document that first spawned the worker.
Inherited from WorkerGlobalScope
WorkerGlobalScope.close()
- Discards any tasks queued in the
WorkerGlobalScope
's event loop, effectively closing this particular scope. WorkerGlobalScope.dump()
- Writes a message to the console.
WorkerGlobalScope.importScripts()
- Imports one or more scripts into the worker's scope. You can specify as many as you'd like, separated by commas. For example:
importScripts('foo.js', 'bar.js');
Implemented from other places
WindowBase64.atob()
- Decodes a string of data which has been encoded using base-64 encoding.
WindowBase64.btoa()
- Creates a base-64 encoded ASCII string from a string of binary data.
WindowTimers.clearInterval()
- Cancels the repeated execution set using
WindowTimers.setInterval()
. WindowTimers.clearTimeout()
- Cancels the repeated execution set using
WindowTimers.setTimeout()
. WindowTimers.setInterval()
- Schedules the execution of a function every X milliseconds.
WindowTimers.setTimeout()
- Sets a delay for executing a function.
Specifications
Specification | Status | Comment |
---|---|---|
WHATWG HTML Living Standard The definition of 'DedicatedWorkerGlobalScope' in that specification. |
Living Standard | No change from Web Workers. |
Web Workers The definition of 'DedicatedWorkerGlobalScope' in that specification. |
Editor's Draft | Initial definition. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 4 | 3.5 (1.9.1) | 10 | 10.6 | 4 |
ononline , onoffline |
(Yes) | 29 (29) | ? | ? | ? |
console |
(Yes) | 29 (29)[1] 30 (30) |
? | ? | ? |
performance |
(Yes) | 34 (34) | ? | ? | ? |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|
Basic support | ? | (Yes) | 1.0 (1.9.1) | 1.0.1 | 10 | 11.5 | 5.1 |
ononline , onoffline |
? | (Yes) | 29.0 (29)[1] 30.0 (30) |
1.4 | ? | ? | ? |
console |
? | (Yes) | 29.0 (29) | 1.4 | ? | ? | ? |
performance |
? | (Yes) | 34.0 (34) | 2.1 | ? | ? | ? |
[1] Gecko 29.0 implemented this as WorkerConsole
. Gecko 30.0 changed this to the regular Console
.