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+---
+title: cookies.onChanged
+slug: Mozilla/Add-ons/WebExtensions/API/cookies/onChanged
+translation_of: Mozilla/Add-ons/WebExtensions/API/cookies/onChanged
+---
+<div>{{AddonSidebar()}}</div>
+
+<p>{{WebExtAPIRef("cookies")}} API 的 <code>onChanged</code> 事件會在 cookie 設定或刪除時觸發。</p>
+
+<p>請注意，更新 cookie 的屬性要透過以下兩個步驟實做：</p>
+
+<ol>
+ <li>首先，要更新的 cookie 會先被刪掉，並產生一個 <code>overwrite</code> 的 {{WebExtAPIRef("cookies.OnChangedCause")}} 提醒。</li>
+ <li>接著，帶著更新數值的新 cookie 會被寫進去，並產生第二個 <code>explicit</code> 的 {{WebExtAPIRef("cookies.OnChangedCause")}} 提醒。</li>
+</ol>
+
+<h2 id="語法">語法</h2>
+
+<pre class="syntaxbox brush:js">browser.cookies.onChanged.addListener(listener)
+browser.cookies.onChanged.removeListener(listener)
+browser.cookies.onChanged.hasListener(listener)
+</pre>
+
+<p>此 API 也能以 <code>browser.cookies.onChanged.*</code> 運行。</p>
+
+<p>此事件有以下函式：</p>
+
+<dl>
+ <dt><code>addListener(callback)</code></dt>
+ <dd>給此事件添加監聽器（listener）。</dd>
+ <dt><code>removeListener(listener)</code></dt>
+ <dd>停止監聽此事件。<code>listener</code> 參數是要移除的監聽器。</dd>
+ <dt><code>hasListener(listener)</code></dt>
+ <dd>檢查此事件的 <code>listener</code> 是否被監聽了。若有監聽，回傳 <code>true</code>，否則回傳 <code>false</code>。</dd>
+</dl>
+
+<h2 id="addListener_語法">addListener 語法</h2>
+
+<h3 id="參數">參數</h3>
+
+<dl>
+ <dt><code>callback</code></dt>
+ <dd>
+ <p>能被呼叫的 callback 函式會在此事件發生的時候觸發。函式會 passed 以下參數：</p>
+
+ <dl class="reference-values">
+  <dt><code>changeInfo</code></dt>
+  <dd>一個含有觸發事件資訊的 <code>object</code>。它有兩個屬性：</dd>
+  <dd>
+  <dl class="reference-values">
+   <dt><code>removed</code></dt>
+   <dd>一個 <code>boolean</code>。如果 cookie 被刪除則為 <code>true</code>，否則為 <code>false</code>。</dd>
+   <dt><code>cookie</code></dt>
+   <dd>一個 {{WebExtAPIRef('cookies.Cookie')}} 物件。含有被設定、或被刪除的 cookie 資訊。</dd>
+   <dt><code>cause</code></dt>
+   <dd>一個 {{WebExtAPIRef('cookies.OnChangedCause')}} 數值。含有 cookie被改變的潛在原因。</dd>
+  </dl>
+  </dd>
+ </dl>
+ </dd>
+</dl>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<p class="hidden">本相容性表格由結構化資料產生。若要貢獻資料，請參考 <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> 並給一個 pull request。</p>
+
+<p>{{Compat("webextensions.api.cookies.onChanged")}}</p>
+
+<h2 id="示例">示例</h2>
+
+<p>本範例監聽 <code>onChanged</code> 事件並紀錄由 <code>changeInfo</code> 參數傳來的資訊：</p>
+
+<pre class="brush: js line-numbers  language-js">browser.cookies.onChanged.addListener(function(changeInfo) {
+  console.log('Cookie changed: ' +
+              '\n * Cookie: ' + JSON.stringify(changeInfo.cookie) +
+              '\n * Cause: ' + changeInfo.cause +
+              '\n * Removed: ' + changeInfo.removed);
+});</pre>
+
+<p>{{WebExtExamples}}</p>
+
+<div class="note"><strong>致謝</strong>
+
+<p>此 API 基於 Chromium 的 <a href="https://developer.chrome.com/extensions/cookies"><code>chrome.cookies</code></a> API 而來，文件改作自 Chromium 程式碼裡的 <a href="https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/api/cookies.json"><code>cookies.json</code></a>。</p>
+
+<p>Microsoft Edge 的相容資訊來自微軟公司，原文以創用 CC 姓名標示 3.0 美國版條款授權大眾使用。</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>