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 Standard The definition of 'self' in that specification. |
Living Standard |
Browser compatibility
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