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+---
+title: i18n.getUILanguage()
+slug: Mozilla/Add-ons/WebExtensions/API/i18n/getUILanguage
+tags:
+  - API
+  - Add-ons
+  - Extensions
+  - Method
+  - Non-standard
+  - Reference
+  - WebExtensions
+  - getUILanguage
+  - i18n
+translation_of: Mozilla/Add-ons/WebExtensions/API/i18n/getUILanguage
+---
+<div>{{AddonSidebar()}}</div>
+
+<p>ブラウザーの UI 言語を取得します。これは、優先されるユーザー言語を返す {{WebExtAPIRef('i18n.getAcceptLanguages')}} とは異なります。</p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox brush:js">browser.i18n.getUILanguage()
+</pre>
+
+<h3 id="Parameters" name="Parameters">引数</h3>
+
+<p>なし。</p>
+
+<h3 id="Return_value" name="Return_value">戻り値</h3>
+
+<p><code>文字列</code>。{{WebExtAPIRef("i18n.LanguageCode")}} によるブラウザーの UI 言語コード。</p>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの実装状況</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.i18n.getUILanguage")}}</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<pre class="brush: js">var uiLanguage = browser.i18n.getUILanguage();
+console.log(uiLanguage);
+
+//e.g. "ja"</pre>
+
+<p>{{WebExtExamples}}</p>
+
+<div class="note"><strong>謝辞</strong>
+
+<p>この API は、Chromium の <a href="https://developer.chrome.com/extensions/i18n#method-getUILanguage"><code>chrome.i18n</code></a> API を基にしています。このドキュメンテーションは、Chromium コード内の <a href="https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/api/i18n.json"><code>i18n.json</code></a> に由来しています。</p>
+
+<p>Microsoft Edge 互換性データは、Microsoft Corporation より供給され、Creative Commons Attribution 3.0 United States License の下で含まれています。</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>