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.
Note: Firefox has a bug with using console.log
inside shared/service workers (see bug 1058644), which may return strange results, but this should be fixed soon.
Specifications
Specification | Status | Comment |
---|---|---|
WHATWG HTML Living Standard The definition of 'self' in that specification. |
Living Standard |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 4 | 3.5 (1.9.1) | (Yes) | 11.5 | 4 |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|
Basic support | ? | 40 | 1.0 (1.9.1) | 1.0.1 | (Yes) | (Yes) | 5.1 |