MessagePort.onmessage - Web API 接口参考 编辑

 MessagePort 接口的 onmessage 事件处理程序是一个EventListener, 当在端口上触发一个类型为 message 的MessageEvent 时被调用 - 即,当端口接收到消息时。

Note: 此特性在 Web Worker 中可用。

Syntax

channel.onmessage = function() { ... };

Example

In the following code block, you can see a new channel being created using the MessageChannel.MessageChannel constructor. When the IFrame has loaded, we pass MessageChannel.port2 to the IFrame using MessagePort.postMessage along with a message. The handleMessage handler then responds to a message being sent back from the IFrame using onmessage, putting it into a paragraph — MessageChannel.port1 is listened to, to check when the message arrives.

var channel = new MessageChannel();
var para = document.querySelector('p');

var ifr = document.querySelector('iframe');
var otherWindow = ifr.contentWindow;

ifr.addEventListener("load", iframeLoaded, false);

function iframeLoaded() {
  otherWindow.postMessage('Hello from the main page!', '*', [channel.port2]);
}

channel.port1.onmessage = handleMessage;
function handleMessage(e) {
  para.innerHTML = e.data;
}   

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

Specifications

Specification	Status	Comment
HTML Living Standard onmessage	Living Standard	No difference from Unknown.
Unknown onmessage	Unknown	W3C version of the spec

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	4	(Yes)	未实现	10.0	10.6	5
Available in workers	(Yes)	?	41 (41)	(Yes)	(Yes)	(Yes)

Feature	Android	Chrome for Android	Edge	Firefox Mobile (Gecko)	Firefox OS (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	4.4	4	(Yes)	未实现	未实现	10.0	11.5	5.1
Available in workers	(Yes)	(Yes)	?	41.0 (41)	(Yes)	(Yes)	(Yes)	(Yes)

See also

• Using channel messaging