---
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 =&gt; {
    setTimeout(() =&gt; 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>