WindowOrWorkerGlobalScope - Web APIs 编辑

The WindowOrWorkerGlobalScope mixin describes several features common to the Window and WorkerGlobalScope interfaces. Each of these interfaces can, of course, add more features in addition to the ones listed below.

Note: WindowOrWorkerGlobalScope is a mixin and not an interface; you can't actually create an object of type WindowOrWorkerGlobalScope.

Properties

These properties are defined on the WindowOrWorkerGlobalScope mixin, and implemented by Window and WorkerGlobalScope.

WindowOrWorkerGlobalScope.caches Read only

Returns the CacheStorage object associated with the current context. This object enables functionality such as storing assets for offline use, and generating custom responses to requests.

WindowOrWorkerGlobalScope.crossOriginIsolated Read only

Returns a boolean value that indicates whether a SharedArrayBuffer can be sent via a Window.postMessage() call.

WindowOrWorkerGlobalScope.indexedDB Read only

Provides a mechanism for applications to asynchronously access capabilities of indexed databases; returns an IDBFactory object.

WindowOrWorkerGlobalScope.isSecureContext Read only

Returns a boolean indicating whether the current context is secure (true) or not (false).

WindowOrWorkerGlobalScope.origin Read only

Returns the origin of the global scope, serialized as a string.

Methods

These methods are defined on the WindowOrWorkerGlobalScope mixin, and implemented by Window and WorkerGlobalScope.

WindowOrWorkerGlobalScope.atob()

Decodes a string of data which has been encoded using base-64 encoding.

WindowOrWorkerGlobalScope.btoa()

Creates a base-64 encoded ASCII string from a string of binary data.

WindowOrWorkerGlobalScope.clearInterval()

Cancels the repeated execution set using WindowOrWorkerGlobalScope.setInterval().

WindowOrWorkerGlobalScope.clearTimeout()

Cancels the delayed execution set using WindowOrWorkerGlobalScope.setTimeout().

WindowOrWorkerGlobalScope.createImageBitmap()

Accepts a variety of different image sources, and returns a Promise which resolves to an ImageBitmap. Optionally the source is cropped to the rectangle of pixels originating at (sx, sy) with width sw, and height sh.

WindowOrWorkerGlobalScope.fetch()

Starts the process of fetching a resource from the network.

WindowOrWorkerGlobalScope.queueMicrotask()

Enqueues a microtask—a short function to be executed after execution of the JavaScript code completes and control isn't being returned to a JavaScript caller, but before handling callbacks and other tasks. This lets your code run without interfering with other, possibly higher priority, code, but before the browser runtime regains control, potentially depending upon the work you need to complete.

WindowOrWorkerGlobalScope.setInterval()

Schedules a function to execute every time a given number of milliseconds elapses.

WindowOrWorkerGlobalScope.setTimeout()

Schedules a function to execute in a given amount of time.

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• Window
• WorkerGlobalScope