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---
title: history.onTitleChanged
slug: Mozilla/Add-ons/WebExtensions/API/history/onTitleChanged
tags:
- History
translation_of: Mozilla/Add-ons/WebExtensions/API/history/onTitleChanged
---
<div>{{AddonSidebar()}}</div>
<div>当document的标题更改时触发</div>
<div> </div>
<div>你可以使用 {{WebExtAPIRef("history.onVisited")}}去进行监听. However, the {{WebExtAPIRef("history.HistoryItem")}} that this event passes to its listener does not include the page title, because the page title is typically not known at the time <code>history.onVisited</code> is sent.</div>
<div> </div>
<div>Instead, the stored {{WebExtAPIRef("history.HistoryItem")}} is updated with the page title after the page has loaded, once the title is known. The history.onTitleChanged event is fired at that time. So if you need to know the titles of pages as they are visited, listen for <code>history.onTitleChanged</code>.</div>
<h2 id="Syntax">Syntax</h2>
<pre class="syntaxbox brush:js">browser.history.onTitleChanged.addListener(listener)
browser.history.onTitleChanged.removeListener(listener)
browser.history.onTitleChanged.hasListener(listener)
</pre>
<p>Events have three functions:</p>
<dl>
<dt><code>addListener(listener)</code></dt>
<dd>Adds a listener to this event.</dd>
<dt><code>removeListener(listener)</code></dt>
<dd>Stop listening to this event. The <code>listener</code> argument is the listener to remove.</dd>
<dt><code>hasListener(listener)</code></dt>
<dd>Check whether <code>listener</code> is registered for this event. Returns <code>true</code> if it is listening, <code>false</code> otherwise.</dd>
</dl>
<h2 id="addListener_syntax">addListener syntax</h2>
<h3 id="Parameters">Parameters</h3>
<dl>
<dt><code>callback</code></dt>
<dd>
<p>Function that will be called when this event occurs. The function will be passed an object with the following properties:</p>
<dl class="reference-values">
<dt><code>url</code></dt>
<dd><code>String</code>. URL of the page visited.</dd>
<dt><code>title</code></dt>
<dd><code>String</code>. Title of the page visited.</dd>
</dl>
</dd>
</dl>
<h2 id="Browser_compatibility">Browser compatibility</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.history.onTitleChanged")}}</p>
<h2 id="Examples">Examples</h2>
<p>Listen for title change events, and log the URL and title of the visited pages.</p>
<pre class="brush: js">function handleTitleChanged(item) {
console.log(item.title);
console.log(item.url);
}
browser.history.onTitleChanged.addListener(handleTitleChanged);</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/history#event-onVisited"><code>chrome.history</code></a> API. This documentation is derived from <a href="https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/api/history.json"><code>history.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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