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---
title: Coordinates.altitudeAccuracy
slug: Web/API/GeolocationCoordinates/altitudeAccuracy
translation_of: Web/API/GeolocationCoordinates/altitudeAccuracy
---
<div>{{APIRef("Geolocation API")}}</div>
<p><code><strong>Coordinates.altitudeAccuracy</strong></code> 是個唯讀的正複數用來代表高度的精準度，單位為公尺，並有 95% 可靠度。如果裝置無法提供這個值則回傳 null。</p>
<h2 id="語法">語法</h2>
<pre class="syntaxbox"><var>altAcc</var> = <var>coordinates</var>.altitudeAccuracy
</pre>
<h2 id="規格">規格</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
</thead>
<tbody>
<tr>
<td>{{SpecName('Geolocation', '#altitudeaccuracy', 'Coordinates.altitudeAccuracy')}}</td>
<td>{{Spec2('Geolocation')}}</td>
<td>Initial specification.</td>
</tr>
</tbody>
</table>
<h2 id="瀏覽器的相容性">瀏覽器的相容性</h2>
{{Compat("api.GeolocationCoordinates.altitudeAccuracy")}}
<h2 id="請參考">請參考</h2>
<ul>
<li><a href="/en-US/docs/WebAPI/Using_geolocation">Using geolocation</a></li>
<li>屬於 {{domxref("Coordinates")}} 介面。</li>
</ul>
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