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---
title: WakeLockSentinel
slug: Web/API/WakeLockSentinel
translation_of: Web/API/WakeLockSentinel
---
<p>{{APIRef("Screen Wake Lock API")}}{{SeeCompatTable}}{{securecontext_header}}</p>
<p><span class="seoSummary">The <strong><code>WakeLockSentinel</code></strong> interface of Screen Wake Lock API provides a handle to a platform wake lock used to prevent screen from turning off, dimming, or displaying a screen saver.</span></p>
<h2 id="属性">属性</h2>
<dl>
<dt>{{DOMxRef("WakeLockSentinel.type")}} {{readonlyInline}}</dt>
<dd>Wake lock type. Currently it is always <code>"screen"</code>.</dd>
</dl>
<h2 id="方法">方法</h2>
<dl>
<dt>{{DOMxRef("WakeLockSentinel.release","WakeLockSentinel.release()")}}</dt>
<dd>Returns a {{JSxRef("Promise")}} that resolves without a value after requesting the underlying wake lock is released.</dd>
</dl>
<h2 id="事件处理程序">事件处理程序</h2>
<dl>
<dt>{{DOMxRef("WakeLockSentinel.onrelease")}}</dt>
<dd>Event handler for <code>release</code> event type which occurs when <code>WakeLockSentinel</code> object's handle has been releases due to either a <code>release()</code> method being called or because {{Glossary("User Agent")}} releases the lock.</dd>
</dl>
<h2 id="示例">示例</h2>
<p>The following example acquires a screen wake lock and then releases it in 10 minutes:</p>
<pre class="notranslate">function tryKeepScreenAlive(minutes) {
navigator.wakeLock.request("screen").then(lock => {
setTimeout(() => lock.release(), minutes * 60 * 1000);
});
}
tryKeepScreenAlive(10);
</pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">规范</th>
<th scope="col">状态</th>
<th scope="col">Comment</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="https://w3c.github.io/screen-wake-lock/#dom-wakelocksentinel">Screen Wake Lock API</a></td>
<td>Editor's Draft</td>
<td>Initial specification.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p>{{Compat("api.WakeLockSentinel")}}</p>
<h2 id="相关链接">相关链接</h2>
<ul>
<li>{{DOMxRef("WakeLock.request", "navigator.wakeLock.request()")}}</li>
</ul>
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