---
title: reading
slug: Web/API/AmbientLightSensor/illuminance
translation_of: Web/API/AmbientLightSensor/illuminance
translation_of_original: Web/API/AmbientLightSensor/reading
original_slug: Web/API/AmbientLightSensor/reading
---
<p>{{SeeCompatTable}}{{APIRef("Ambient Light Sensor API")}}</p>

<p><span class="seoSummary">{{domxref("AmbientLightSensor")}} 接口的 read-only 属性 <strong>reading</strong> 返回一个访问 {{domxref('AmbientLightSensorReading')}} 的接口, 包含当前的光亮级别。</span></p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox">var sensorReading = AmbientLightLevel.reading</pre>

<h3 id="返回值">返回值</h3>

<p>{{domxref('AmbientLightSensorReading')}} 接口.</p>

<h2 id="用例">用例</h2>

<pre class="brush: js">// TBD</pre>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('AmbientLight')}}</td>
   <td>{{Spec2('AmbientLight')}}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

<div>{{CompatibilityTable}}</div>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatChrome(54.0)}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Android Webview</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>Firefox OS</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
   <th>Chrome for Android</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatChrome(54.0)}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatChrome(54.0)}}</td>
  </tr>
 </tbody>
</table>
</div>