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+---
+title: HTMLElement.lang
+slug: Web/API/HTMLElement/lang
+tags:
+  - API
+  - HTML DOM
+  - HTMLElement
+  - NeedsBrowserCompatibility
+  - NeedsUpdate
+  - Property
+  - Reference
+translation_of: Web/API/HTMLElement/lang
+---
+<div>{{ APIRef("HTML DOM") }}</div>
+
+<p><code><strong>HTMLElement.lang</strong></code> 屬性（{{Glossary("property")}}）可以讀取或設定一個表示元素之語系的標籤屬性（{{Glossary("attribute")}}）值。</p>
+
+<p><code>HTMLElement.lang</code> 屬性所回傳的語系代碼定義於網際網路工程任務小組（IETF）的 <a class="external" href="https://www.ietf.org/rfc/bcp/bcp47.txt"><em>Tags for Identifying Languages (BCP47)</em></a> 文件中。常見的例子如 "en" 代表英語、"ja" 代表日語、"es" 代表西班牙語等等。此標籤屬性的預設值為 <code>unknown</code>。請留意，雖然此標籤屬性於個別層級的元素上是有效的，但大部分都設定於文件的根元素。</p>
+
+<p><code>HTMLElement.lang</code> 屬性只對 <code>lang</code> 標籤屬性有作用，而不是 <code>xml:lang</code>。</p>
+
+<h2 id="Syntax" name="Syntax">語法</h2>
+
+<pre class="syntaxbox">var <var>languageUsed</var> = elementNodeReference.lang; // Get the value of lang
+elementNodeReference.lang = <var>NewLanguage</var>; // Set new value for lang
+</pre>
+
+<p><var>languageUsed</var> is a string variable that gets the language in which the text of the current element is written. <var>NewLanguage</var> is a string variable with its value setting the language in which the text of the current element is written.</p>
+
+<h2 id="Example" name="Example">範例</h2>
+
+<pre class="brush: js">// this snippet compares the base language and
+// redirects to another url based on language
+if (document.documentElement.lang === "en") {
+  window.location.href = "Some_document.html.en";
+} else if (document.documentElement.lang === "ru") {
+  window.location.href = "Some_document.html.ru";
+}</pre>
+
+<h2 id="Specification" name="Specification">規範</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('DOM2 HTML', 'html.html#ID-59132807', 'lang')}}</td>
+   <td>{{Spec2('DOM2 HTML')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<p> </p>