MessagePort.start()

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start() 方法在 MessagePort interface starts the sending of messages queued on the port. This method is only needed when using EventTarget.addEventListener ; it is implied when using MessageChannel.onmessage .

注意： 此特征可用于 Web 工作者 .

句法

port.start()

Void.

参数

None.

范例

In the following code block, you can see a handleMessage handler function, run when a message is sent back to this document using onmessage :

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

Another option would be to do this using EventTarget.addEventListener , however, when this method is used, you need to explicitly call start() to begin the flow of messages to this document:

channel.port1.addEventListener('message', handleMessage, false);
function handleMessage(e) {
  para.innerHTML = e.data;
  textInput.value = '';
}
channel.port1.start();

规范

规范	状态	注释
HTML 实时标准 The definition of 'start()' 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
`start`	Chrome 4	Edge 12	Firefox Yes	IE 10	Opera 10.6	Safari 5	WebView Android Yes	Chrome Android 18	Firefox Android 不支持 No	Opera Android 11	Safari iOS 5.1	Samsung Internet Android 1.0

图例

完整支持
不支持

另请参阅

Using channel messaging

元数据

最后修改： 2019 年 3 月 23 日

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