ServiceWorkerMessageEvent.lastEventId

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句法
范例
浏览器兼容性
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弃用
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the 兼容性表格 at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

重要 : In modern browsers, this property has been deprecated. Service worker messages will now use the MessageEvent interface, for consistency with other web messaging features.

lastEventID 只读特性在 ServiceWorkerMessageEvent interface represents, in 服务器发送事件 , the last event ID of the event source.

句法

var myLastEventId = ServiceWorkerMessageEventInstance.lastEventId;

值

A DOMString .

范例

When the following code is used inside the main thread to set up a message channel between it and a service worker for sending messages between the two, the event object of onmessage 将是 ServiceWorkerMessageEvent .

navigator.serviceWorker.ready.then(function(reg) {
  ...
      // set up a message channel to communicate with the SW
      var channel = new MessageChannel();
      channel.port1.onmessage = function(e) {
        console.log(e.lastEventId);
        handleChannelMessage(e.data);
      }
      mySW = reg.active;
      mySW.postMessage('hello', [channel.port2]);
  });

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`lastEventId` 弃用	Chrome 45	Edge 17 17 16 Disabled Disabled From version 16: this feature is behind the `Enable service workers` preference.	Firefox 不支持 44 — 55 注意事项 44 — 55 注意事项 Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API. In Firefox 55 and later, the standard `MessageEvent` interface must be used instead.	IE 不支持 No	Opera 24	Safari 不支持 No	WebView Android 不支持 No	Chrome Android 45	Firefox Android 不支持 44 — 55	Opera Android 24	Safari iOS 不支持 No	Samsung Internet Android 4.0

图例

完整支持
不支持
弃用。不要用于新网站。

用户必须明确启用此特征。

另请参阅

元数据

最后修改： Dec 26, 2019

服务工作者 API
ServiceWorkerMessageEvent
构造函数
1. ServiceWorkerMessageEvent()
特性
1. data
2. lastEventId
3. origin
4. ports
5. source
Related pages for Service Workers API

在此页

句法

值

范例

浏览器兼容性

图例

另请参阅

相关话题