PeriodicSyncEvent.tag - Web APIs 编辑

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The tag read-only property of the PeriodicSyncEvent interface returns the developer-defined identifier for the PeriodicSyncEvent. This is specified when calling the PeriodicSyncManager.register() method of the PeriodicSyncManager interface. Multiple tags can be used by the web app to run different periodic tasks at different frequencies.

Syntax

const tag = PeriodicSyncEvent.tag;

Value

Returns a String of the defined identifier.

Examples

The following example demonstrates listening for a periodic sync event in the service worker, and accessing the tag property.

self.addEventListener('periodicsync', event => {
  console.log(event.tag); // logs the events tag
});

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• Richer offline experiences with the Periodic Background Sync API
• A Periodic Background Sync demo app