在此页

• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

message event is fired on a BroadcastChannel object when a message arrives on that channel.

冒泡	No
可取消	No
接口	MessageEvent
事件处理程序特性	onmessage

范例

实时范例

In this example there's a "sender" <iframe> that broadcasts the contents of a <textarea> when the user clicks a button. There are two "receiver" iframes that listen to the broadcast message and write the result into a <div> 元素。

Sender

<h1>Sender</h1>
<label for="message">Type a message to broadcast:</label><br/>
<textarea id="message" name="message" rows="1" cols="40">Hello</textarea>
<button id="broadcast-message" type="button">Broadcast message</button>
					

body {
     border: 1px solid black;
     padding: .5rem;
     height: 150px;
     font-family: "Fira Sans", sans-serif;
}
h1 {
    font: 1.6em "Fira Sans", sans-serif;
    margin-bottom: 1rem;
}
textarea {
    padding: .2rem;
}
label, br {
    margin: .5rem 0;
}
button {
    vertical-align: top;
    height: 1.5rem;
}
					

const channel = new BroadcastChannel('example-channel');
const messageControl = document.querySelector('#message');
const broadcastMessageButton = document.querySelector('#broadcast-message');
broadcastMessageButton.addEventListener('click', () => {
    channel.postMessage(messageControl.value);
})
					

Receiver 1

<h1>Receiver 1</h1>
<div id="received"></div>
					

body {
    border: 1px solid black;
    padding: .5rem;
    height: 100px;
    font-family: "Fira Sans", sans-serif;
}
h1 {
    font: 1.6em "Fira Sans",
    sans-serif; margin-bottom: 1rem;
}
					

const channel = new BroadcastChannel('example-channel');
channel.addEventListener('message', (event) => {
  received.textContent = event.data;
});
					

Receiver 2

<h1>Receiver 2</h1>
<div id="received"></div>
					

body {
    border: 1px solid black;
    padding: .5rem;
    height: 100px;
    font-family: "Fira Sans", sans-serif;
}
h1 {
    font: 1.6em "Fira Sans", sans-serif;
    margin-bottom: 1rem;
}
					

const channel = new BroadcastChannel('example-channel');
channel.addEventListener('message', (event) => {
  received.textContent = event.data;
});
					

结果

规范

规范	状态
HTML 实时标准	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
message event	Chrome 54	Edge ≤79	Firefox 38	IE No	Opera 41	Safari No	WebView Android 54	Chrome Android 54	Firefox Android ?	Opera Android 41	Safari iOS No	Samsung Internet Android 6.0

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

另请参阅

• 相关事件： messageerror .

元数据

• 最后修改： Jul 27, 2020

相关话题

1. BroadcastChannel
2. 构造函数

   1. BroadcastChannel()
3. 特性

   1. 名称
   2. onmessage
   3. onmessageerror
4. 方法

   1. close()
   2. postMessage()
5. 事件

   1. message
   2. messageerror
6. 继承：

   1. EventTarget