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+---
+title: cookies.OnChangedCause
+slug: Mozilla/Add-ons/WebExtensions/API/cookies/OnChangedCause
+translation_of: Mozilla/Add-ons/WebExtensions/API/cookies/OnChangedCause
+---
+<div>{{AddonSidebar()}}</div>
+
+<p>{{WebExtAPIRef("cookies")}} API 的 <code>OnChangedCause</code> 型別，代表觸發 cookie 資料變動的原因。</p>
+
+<h2 id="型別">型別</h2>
+
+<p>此型別的所有值都是字串（string）。可用值包括：</p>
+
+<dl>
+ <dt><code>evicted</code></dt>
+ <dd>由於垃圾回收（garbage collection）而被刪除的 cookie。</dd>
+ <dt><code>expired</code></dt>
+ <dd>由於過期而被刪除的 cookie。</dd>
+ <dt><code>explicit</code></dt>
+ <dd>透過顯式呼叫（explicit call）{{WebExtAPIRef("cookies.remove()")}} 而被插入或刪除的 cookie。</dd>
+ <dt><code>expired_overwrite</code></dt>
+ <dd>被已過期（already-expired expiration date）cookie 所覆寫的 cookie。</dd>
+ <dt><code>overwrite</code></dt>
+ <dd>A call to {{WebExtAPIRef("cookies.set()")}} overwrote this cookie with a different one.</dd>
+</dl>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</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.cookies.OnChangedCause")}}</p>
+
+<h2 id="示例">示例</h2>
+
+<p>你可以在 cookie 變更的時候監聽被通知的 {{WebExtAPIRef("cookies.onChanged")}} 事件。此監聽器 passed 含有 <code>cause</code> 屬性，值為 <code>OnChangeCaused</code> 字串的 <code>changeInfo</code> 物件：</p>
+
+<pre class="brush: 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>