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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>