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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>
-<p>{{Compat("api.Element.getAttributeNames")}}</p>
-</div>