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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: Element.getAttributeNames()
+slug: Web/API/Element/getAttributeNames
+tags:
+ - API
+ - DOM
+ - Element
+ - getAttributeNames
+ - メソッド
+ - 属性
+translation_of: Web/API/Element/getAttributeNames
+---
+<div>{{APIRef("DOM")}}</div>
+
+<p>{{domxref("Element")}} インターフェースの <strong><code>getAttributeNames()</code></strong> メソッドは要素の属性の名前を文字列の {{jsxref("Array")}} で返します。要素に属性がない場合は、空の配列を返します。</p>
+
+<p><code>getAttributeNames()</code> を {{domxref("Element.getAttribute","getAttribute()")}} と共に使用すると、 {{domxref("Element.attributes")}} にアクセスするよりメモリ効率やパフォーマンスが良くなります。</p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox notranslate"><em>let attributeNames</em> = element.getAttributeNames();
+</pre>
+
+<h2 id="Example" name="Example">例</h2>
+
+<pre class="brush:js notranslate">// 要素の属性に対して反復処理する
+for(let name of element.getAttributeNames()) {
+ let value = element.getAttribute(name);
+ console.log(name, value);
+}
+</pre>
+
+<h2 id="Polyfill" name="Polyfill">代替モジュール</h2>
+
+<pre class="brush:js notranslate">if (Element.prototype.getAttributeNames == undefined) {
+ Element.prototype.getAttributeNames = function () {
+ var attributes = this.attributes;
+ var length = attributes.length;
+ var result = new Array(length);
+ for (var i = 0; i &lt; length; i++) {
+ result[i] = attributes[i].name;
+ }
+ return result;
+ };
+}</pre>
+
+<h2 id="Specifications" name="Specifications">仕様書</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">仕様書</th>
+ <th scope="col">状態</th>
+ <th scope="col">備考</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName("DOM WHATWG", "#dom-element-getattributenames", "Element.getAttributeNames")}}</td>
+ <td>{{Spec2("DOM WHATWG")}}</td>
+ <td>初回定義</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの対応</h2>
+
+<div>
+<div class="hidden">このページの互換表は構造化データで作成されました。データに貢献したい方は、 <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> をチェックしてプルリクエストを送ってください。</div>
+
+<p>{{Compat("api.Element.getAttributeNames")}}</p>
+</div>