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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: Navigator.deviceMemory
+slug: Web/API/Navigator/deviceMemory
+tags:
+ - API
+ - Device Memory API
+ - Navigator
+ - Property
+ - Reference
+ - deviceMemory
+ - memory
+translation_of: Web/API/Navigator/deviceMemory
+---
+<div>{{APIRef("Device Memory")}}{{securecontext_header}}{{SeeCompatTable}}</div>
+
+<p><span class="seoSummary"><strong><code>deviceMemory</code></strong> は {{domxref("Navigator")}} インターフェイスの読み取り専用プロパティで、端末のおよそのメモリ量をギガバイト単位で返します。</span>この値は概数で、最も近い2の指数に切り下げ、1024で割った数字になります。また、とても低性能または高性能の端末を使用している人のプライバシーを守るため、上限値と下限値が使用されます。</p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox"><em>memoryAmount</em> = navigator.deviceMemory</pre>
+
+<h3 id="Value" name="Value">値</h3>
+
+<p>浮動小数点値で <code>0.25</code>, <code>0.5</code>, <code>1</code>, <code>2</code>, <code>4</code>, <code>8</code> のうちのいずれかです。</p>
+
+<h2 id="Example" name="Example">例</h2>
+
+<pre class="brush: js">const memory = navigator.deviceMemory
+console.log (`This device has at least ${memory}GiB of RAM.`)
+</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("Device Memory","#sec-device-memory-js-api","deviceMemory")}}</td>
+ <td>{{Spec2("Device Memory")}}</td>
+ <td>初回定義</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+<div class="hidden">このページの互換性一覧表は構造化データから生成されています。データに協力していただけるのであれば、 <a class="external" href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> をチェックアウトしてプルリクエストを送信してください。</div>
+
+<p>{{Compat("api.Navigator.deviceMemory")}}</p>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li><a href="/ja/docs/Web/API/Device_Memory_API">Device Memory API</a></li>
+ <li>{{HTTPHeader("Device-Memory")}} HTTP header</li>
+</ul>