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+---
+title: PositionOptions.maximumAge
+slug: Web/API/PositionOptions/maximumAge
+translation_of: Web/API/PositionOptions/maximumAge
+---
+<div>{{APIRef("Geolocation API")}}</div>
+
+<p><code><strong>PositionOptions.maximumAge</strong></code> 是一個正值，它代表可以接受暫存位置的最長期限（單位是毫秒）。如果設定為 0，代表機器必須回傳實際的當前位置而不能使用暫存位置。如果設定為 <code><a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Infinity">Infinity</a></code>， 機器必定會回傳暫存位置而不考慮他的期限。預設值：0。</p>
+
+<h2 id="語法">語法</h2>
+
+<pre class="syntaxbox"><var>positionOptions</var>.maximumAge = <var>timeLength</var>
+</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', '#maximumage', 'PositionOptions.maximumAge')}}</td>
+   <td>{{Spec2('Geolocation')}}</td>
+   <td>Initial definition</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("PositionOptions")}} 。</li>
+</ul>