客户端：类型属性

注意：此功能仅在 Service Workers 中可用。

type 是 Client 接口的只读属性，它指示 Service Worker 控制的客户端类型。

值

一个字符串，表示客户端类型。该值可以是以下之一：

  • "window"
  • "worker"
  • "sharedworker"

示例

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

// controlling service worker
self.addEventListener("message", (e) => {
  // e.source is a client object
  e.source.postMessage(`Hello! Your message was: ${e.data}`);
  // Let's also post the type value back to the client
  e.source.postMessage(e.source.type);
});

规范

规范
Service Workers
# client-type

浏览器兼容性

BCD 表格仅在浏览器中加载