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---
title: tabs.onActivated
slug: Mozilla/Add-ons/WebExtensions/API/tabs/onActivated
translation_of: Mozilla/Add-ons/WebExtensions/API/tabs/onActivated
---
<div>{{AddonSidebar()}}</div>
<div>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 {{WebExtAPIRef("tabs.onUpdated")}} 事件在 URL 被设置后得到通知。</div>
<h2 id="语法">语法</h2>
<pre class="syntaxbox brush:js">browser.tabs.onActivated.addListener(listener)
browser.tabs.onActivated.removeListener(listener)
browser.tabs.onActivated.hasListener(listener)
</pre>
<p>此事件有三个方法:</p>
<dl>
<dt><code>addListener(callback)</code></dt>
<dd>向此事件添加一个监听。</dd>
<dt><code>removeListener(listener)</code></dt>
<dd>停止监听此事件。 <code>listener</code> 参数是将要移除的监听。</dd>
<dt><code>hasListener(listener)</code></dt>
<dd>检查 <code>listener</code> 是否在此事件中注册。如果正在监听返回 <code>true</code> ，否则 <code>false。</code></dd>
</dl>
<h2 id="addListener_语法">addListener 语法</h2>
<h3 id="参数">参数</h3>
<dl>
<dt><code>callback</code></dt>
<dd>
<p>事件发生时被执行的方法。以下参数会被传递至该方法：</p>
<dl class="reference-values">
<dt><code>activeInfo</code></dt>
<dd><a href="#activeInfo"><code>object</code></a>. 被激活标签的ID , 以及它的窗体的 ID 。</dd>
</dl>
</dd>
</dl>
<h2 id="额外的对象">额外的对象</h2>
<h3 id="activeInfo">activeInfo</h3>
<dl class="reference-values">
<dt><code>tabId</code></dt>
<dd><code>integer</code>. 被激活的标签的ID。</dd>
<dt><code>windowId</code></dt>
<dd><code>integer</code>. 此标签的窗体的ID。</dd>
</dl>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
<p>{{Compat("webextensions.api.tabs.onActivated")}}</p>
<h2 id="示例">示例</h2>
<p>监听并记录标签激活事件:</p>
<pre class="brush: js">function handleActivated(activeInfo) {
console.log("Tab " + activeInfo.tabId +
" was activated");
}
browser.tabs.onActivated.addListener(handleActivated);</pre>
<p>{{WebExtExamples}}</p>
<div class="note"><strong>Acknowledgements</strong>
<p>This API is based on Chromium's <a href="https://developer.chrome.com/extensions/tabs#event-onActivated"><code>chrome.tabs</code></a> API. This documentation is derived from <a href="https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/api/tabs.json"><code>tabs.json</code></a> in the Chromium code.</p>
<p>Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.</p>
</div>
<div class="hidden">
<pre>// Copyright 2015 The Chromium Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
</pre>
</div>
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