MessageChannel | Web API

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特性
构造函数
范例
规范
浏览器兼容性
另请参阅
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MessageChannel 接口在通道消息 API allows us to create a new message channel and send data through it via its two MessagePort 特性。

注意： 此特征可用于 Web 工作者 .

特性

MessageChannel.port1 只读
MessageChannel.port2 只读

构造函数

MessageChannel()

范例

In the following example, you can see a new channel being created using the MessageChannel.MessageChannel 构造函数。

When the IFrame has loaded, we register an onmessage handler for MessageChannel.port1 and transfer MessageChannel.port2 to the IFrame using the window.postMessage method along with a message.

When a message is received back from the IFrame, the onMessage function simply outputs the message to a paragraph.

var channel = new MessageChannel();
var output = document.querySelector('.output');
var iframe = document.querySelector('iframe');
// Wait for the iframe to load
iframe.addEventListener("load", onLoad);
function onLoad() {
  // Listen for messages on port1
  channel.port1.onmessage = onMessage;
  // Transfer port2 to the iframe
  iframe.contentWindow.postMessage('Hello from the main page!', '*', [channel.port2]);
}
// Handle messages received on port1
function onMessage(e) {
  output.innerHTML = e.data;
}

For a full working example, see our channel messaging basic demo on Github ( run it live too ).

规范

规范	状态	注释
HTML 实时标准 The definition of 'Message channels' in that specification.	实时标准

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
`MessageChannel`	Chrome 4	Edge 12	Firefox 41	IE 10	Opera 10.6	Safari 5	WebView Android 4.4	Chrome Android 18	Firefox Android 41	Opera Android 11	Safari iOS 5.1	Samsung Internet Android 1.0
`MessageChannel()` 构造函数	Chrome 4	Edge 12	Firefox 41	IE 10	Opera 10.6	Safari 5	WebView Android 4.4	Chrome Android 18	Firefox Android 41	Opera Android 11	Safari iOS 5.1	Samsung Internet Android 1.0
`port1`	Chrome 4	Edge 12	Firefox 41	IE 10	Opera 10.6	Safari 5	WebView Android 4.4	Chrome Android 18	Firefox Android 41	Opera Android 11	Safari iOS 5.1	Samsung Internet Android 1.0
`port2`	Chrome 4	Edge 12	Firefox 41	IE 10	Opera 10.6	Safari 5	WebView Android 4.4	Chrome Android 18	Firefox Android 41	Opera Android 11	Safari iOS 5.1	Samsung Internet Android 1.0

图例

完整支持

另请参阅

Using channel messaging

元数据

最后修改： 2019 年 3 月 23 日

在此页

特性

构造函数

范例

规范

浏览器兼容性

图例

另请参阅

相关话题