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---
title: Coordinates.speed
slug: Web/API/GeolocationCoordinates/speed
translation_of: Web/API/GeolocationCoordinates/speed
---
<div>{{APIRef("Geolocation API")}}</div>
<p><code><strong>Coordinates.speed</strong></code> 回傳唯讀的正複數代表速度，單位為公尺/秒。 如果裝置無法測量這個值則回傳 null。</p>
<h2 id="語法">語法</h2>
<pre class="syntaxbox"><var>speed</var> = <var>coordinates</var>.speed
</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', '#speed', 'Coordinates.speed')}}</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>
<p>{{CompatibilityTable}}</p>
<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</th>
</tr>
<tr>
<td>Basic support</td>
<td>5</td>
<td>{{CompatGeckoDesktop("1.9.1")}}</td>
<td>9</td>
<td>10.60<br>
{{CompatNo}} 15.0<br>
16.0</td>
<td>5</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatGeckoMobile("4")}}</td>
<td>{{CompatUnknown}}</td>
<td>10.60</td>
<td>{{CompatUnknown}}</td>
</tr>
</tbody>
</table>
</div>
<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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