WorkerGlobalScope.performance - Web APIs 编辑

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

Browser compatibility

BCD tables only load in the browser

See also

• Performance