The self
read-only property of the WorkerGlobalScope
interface returns a reference to the WorkerGlobalScope
itself. Most of the time it is a specific scope like DedicatedWorkerGlobalScope
, SharedWorkerGlobalScope
, or ServiceWorkerGlobalScope
.
Syntax
var selfRef = self;
Value
A global scope object (differs depending on the type of worker you are dealing with, as indicated above).
Example
If you called
console.log(self);
inside a worker, you will get a worker global scope of the same type as that worker object written to the console — something like the following:
DedicatedWorkerGlobalScope {
undefined: undefined, Infinity: Infinity, Math: MathConstructor, NaN: NaN, Intl: Object…}
Infinity: Infinity
Array: function Array() { [native code] }
arguments: null
caller: null
isArray: function isArray() { [native code] }
length: 1
name: "Array"
observe: function observe() { [native code] }
prototype: Array[0]
unobserve: function unobserve() { [native code] }
__proto__: function Empty() {}
<function scope>
ArrayBuffer: function ArrayBuffer() { [native code] }
Blob: function Blob() { [native code] }
Boolean: function Boolean() { [native code] }
DataView: function DataView() { [native code] }
Date: function Date() { [native code] }
DedicatedWorkerGlobalScope: function DedicatedWorkerGlobalScope() { [native code] }
Error: function Error() { [native code] }
// etc. etc.
This provides a full list of the objects available to that worker scope, so it is quite a useful test if you want to see whether something is available to your worker or not. We also maintain a list of Functions and classes available to Web Workers.
Specifications
Specification | Status | Comment |
HTML Living StandardThe definition of 'self' in that specification. | Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
self
|
Chrome
Full support 4 |
Edge
Full support 12 |
Firefox
Full support 3.5 |
IE
Full support Yes |
Opera
Full support 11.5 |
Safari
Full support 4 |
WebView Android
Full support 37 |
Chrome Android
Full support 40 |
Firefox Android
Full support 34 |
Opera Android
Full support Yes |
Safari iOS
Full support 5.1 |
Samsung Internet Android
Full support 4.0 |
Legend
- Full support
- Full support
See also
WorkerGlobalScope.self by Mozilla Contributors is licensed under CC-BY-SA 2.5.