WorkerGlobalScope.performance
The performance
read-only property of the
WorkerGlobalScope
interface returns a Performance
object
to be used on the worker.
Not all Performance
properties and methods are available to Web
workers.
This property is Read only .
Syntax
var perfObj = self.performance;
Return Value
A Performance
object.
Example
If you called
console.log(performance);
inside a worker (which would basically be the equivalent of
self.console.log(self.performance);
, as these are being called on the
worker scope, which can be referenced with WorkerGlobalScope.self
), you
will get a WorkerPerformance
object written to the console — something
like the following:
WorkerPerformance {now: function}
__proto__: WorkerPerformance
constructor: function WorkerPerformance() { [native code] }
now: function now() { [native code] }
__proto__: Object
You could use this performance object to return performance data, as you might do with
a normal Performance
object.
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 |
---|---|---|
High Resolution Time Level 2 The definition of 'performance' in that specification. |
Recommendation | Defines WorkerGlobalScope.performance. |
Browser compatibility
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