ExtendableMessageEvent.ports

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句法
范例
规范
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ports 只读特性在 ExtendableMessageEvent interface returns the array containing the MessagePort objects representing the ports of the associated message channel (the channel the message is being sent through.)

句法

var myPorts = extendableMessageEvent.ports;

值

An array of MessagePort 对象。

范例

When the following code is used inside a service worker to respond to a push messages by sending the data received via PushMessageData to the main context via a channel message , the event object of onmessage 将是 ExtendableMessageEvent .

var port;
self.addEventListener('push', function(e) {
  var obj = e.data.json();
  if(obj.action === 'subscribe' || obj.action === 'unsubscribe') {
    port.postMessage(obj);
  } else if(obj.action === 'init' || obj.action === 'chatMsg') {
    port.postMessage(obj);
  }
});
self.onmessage = function(e) {
  port = e.ports[0];
}

规范

规范	状态	注释
服务工作者 The definition of 'ExtendableMessageEvent.ports' in that specification.	工作草案	初始定义。

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
`ports`	Chrome ?	Edge ?	Firefox 45 注意事项 45 注意事项 Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE 不支持 No	Opera ?	Safari 不支持 No	WebView Android 不支持 No	Chrome Android ?	Firefox Android 45	Opera Android ?	Safari iOS 不支持 No	Samsung Internet Android ?

图例

完整支持
不支持
兼容性未知 ?
实验。期望将来行为有所改变。

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元数据

最后修改： Jul 5, 2020

服务工作者 API
ExtendableMessageEvent
构造函数
1. ExtendableMessageEvent()
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

规范

浏览器兼容性

图例

另请参阅

相关话题