Client

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这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。

The Client interface of the ServiceWorker API represents the scope of a service worker client. A service worker client is either a document in a browser context or a SharedWorker, which is controlled by an active worker. A client object acts as a snapshot representation of its associated service worker client in the scope of a service worker.

Methods

Client.postMessage()
Allows a service worker to send a message to a ServiceWorkerClient.

Properties

Client.frameType 只读
Indicates the type of browsing context of the current client. This value can be one of auxiliary, top-level, nested, or none.
Client.id 只读
Returns the universally unique identifier of the Client object.
Client.url 只读
The URL of the current service worker client.

Examples

This code is based on a snippet taken from the service worker post-message sample (see post-message live.) The code sends message data to which the service worker can reply via Client.postMessage().

The message is wrapped in a promise that resolves if the response doesn't contain an error and rejects with the error.

// service worker client (e.g. a document)
function sendMessage(message) {
  return new Promise(function(resolve, reject) {
    // note that this is the ServiceWorker.postMessage version
    navigator.serviceWorker.controller.postMessage(message);
    window.serviceWorker.onMessage = function(e) {
      resolve(e.data);
    };
  });
}

// controlling service worker
self.addEventListener("message", function(e) {
  // e.source is a client object
  e.source.postMessage("Hello! Your message was: " + e.data);
});

Specifications

Specification Status Comment
Service Workers
Client		 Working Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 40.0[1] 44.0 (44.0)[2] 未实现 ? 未实现
Feature Android Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? 44.0 (44.0) ? 未实现 ? 未实现 ?

See also

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