tabs.onActivated

当窗体的活动标签变化时触发。请注意事件触发时标签的 URL 可能尚未设置，但是你可以通过监听 tabs.onUpdated 事件在 URL 被设置后得到通知。

语法

browser.tabs.onActivated.addListener(listener)
browser.tabs.onActivated.removeListener(listener)
browser.tabs.onActivated.hasListener(listener)

此事件有三个方法:

addListener(callback): 向此事件添加一个监听。
removeListener(listener): 停止监听此事件。 listener 参数是将要移除的监听。
hasListener(listener): 检查 listener 是否在此事件中注册。如果正在监听返回 true ，否则 false。

addListener 语法

参数

callback

事件发生时被执行的方法。以下参数会被传递至该方法：

activeInfo: object. 被激活标签的ID , 以及它的窗体的 ID 。

额外的对象

activeInfo

tabId: integer. 被激活的标签的ID。
windowId: integer. 此标签的窗体的ID。

浏览器兼容性

Update compatibility data on GitHub

	Desktop				Mobile
	Chrome	Edge	Firefox	Opera	Firefox for Android
`onActivated`	Chrome Full support Yes	Edge Full support 14	Firefox Full support 45	Opera Full support Yes	Firefox Android Full support 54

Legend

Full support: Full support

示例

监听并记录标签激活事件:

function handleActivated(activeInfo) {
  console.log("Tab " + activeInfo.tabId +
              " was activated");
}

browser.tabs.onActivated.addListener(handleActivated);

Example extensions

Acknowledgements

This API is based on Chromium's chrome.tabs API. This documentation is derived from tabs.json in the Chromium code.

Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.

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