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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: StorageManager.persisted()
+slug: Web/API/StorageManager/persisted
+tags:
+ - Method
+ - Reference
+ - Secure context
+ - Storage API
+ - persisted()
+translation_of: Web/API/StorageManager/persisted
+---
+<p>{{securecontext_header}}{{APIRef("Storage")}}{{SeeCompatTable}}</p>
+
+<p><span class="seoSummary">{{domxref("StorageManager")}} インターフェイスの <strong><code>persisted()</code></strong> メソッドは、サイトのストレージに対してボックスモードが永続的であれば <code>true</code> に解決される {{jsxref("Promise")}} を返します。</span></p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox">navigator.storage.persisted().then(function(persistent) { ... })</pre>
+
+<h3 id="Parameters" name="Parameters">パラメーター</h3>
+
+<p>なし。</p>
+
+<h3 id="Returns" name="Returns">戻り値</h3>
+
+<p>{{jsxref('Boolean')}} に解決される {{jsxref("Promise")}}。</p>
+
+<h2 id="Example" name="Example">例</h2>
+
+<pre class="brush: js"><code>if (navigator.storage &amp;&amp; navigator.storage.persist)
+  navigator.storage.persisted().then(function(persistent) {
+    if (persistent)
+      console.log("明示的なユーザー操作以外では、ストレージは消去されません。");
+    else
+      console.log("ストレージは UA によってストレージの圧力により消去されるかもしれません。");
+  });</code></pre>
+
+<h2 id="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">仕様</th>
+ <th scope="col">状態</th>
+ <th scope="col">コメント</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('Storage','#dom-storagemanager-persisted','persisted')}}</td>
+ <td>{{Spec2('Storage')}}</td>
+ <td>初期定義</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_Compatibility" name="Browser_Compatibility">ブラウザーの互換性</h2>
+
+
+
+<p>{{Compat("api.StorageManager.persisted")}}</p>