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+---
+title: Geolocation.watchPosition()
+slug: Web/API/Geolocation/watchPosition
+translation_of: Web/API/Geolocation/watchPosition
+---
+<p>{{ APIref("Geolocation API") }}</p>
+
+<p><strong><code>Geolocation.watchPosition()</code></strong> 用于注册监听器,在设备的地理位置发生改变的时候自动被调用。也可以选择特定的错误处理函数。</p>
+
+<p>该方法会返回一个 ID,如要取消监听可以通过  {{domxref("Geolocation.clearWatch()")}} 传入该 ID 实现取消的目的。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>id</em> = navigator.geolocation.watchPosition(<em>success[</em>, <em>error[</em>, <em>options]]</em>)</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><em>success</em></dt>
+ <dd>成功时候的回调函数, 同时传入一个 {{domxref("Position")}} 对象当作参数。</dd>
+ <dt><em>error</em> {{optional_inline}}</dt>
+ <dd>失败时候的回调函数,可选, 会传入一个 {{domxref("PositionError")}} 对象当作参数。</dd>
+ <dt><em>options</em> {{optional_inline}}</dt>
+ <dd>一个可选的 {{domxref("PositionOptions")}} 对象。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js">var id, target, options;
+
+function success(pos) {
+ var crd = pos.coords;
+
+ if (target.latitude === crd.latitude &amp;&amp; target.longitude === crd.longitude) {
+ console.log('Congratulations, you reached the target');
+ navigator.geolocation.clearWatch(id);
+ }
+}
+
+function error(err) {
+ console.warn('ERROR(' + err.code + '): ' + err.message);
+}
+
+target = {
+ latitude : 0,
+ longitude: 0
+};
+
+options = {
+ enableHighAccuracy: false,
+ timeout: 5000,
+ maximumAge: 0
+};
+
+id = navigator.geolocation.watchPosition(success, error, options);
+</pre>
+
+<h2 id="注意">注意</h2>
+
+<p>如果你的应用程序运行在 firefox OS 上,请参考下 <a href="/en-US/docs/Web/API/Geolocation/navigator.requestWakeLock()">geolocation wake lock</a> ,以便在屏幕关闭的时候,程序可以运行在后台以继续监听位置的变化。</p>
+
+<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">说明</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName('Geolocation', '#watch-position', 'Geolocation.watchPosition()')}}</td>
+ <td>{{Spec2('Geolocation')}}</td>
+ <td>Initial specification.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</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>
+ Removed in 15.0<br>
+ Reintroduced in 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="sect1"> </h2>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/API/Geolocation/navigator.requestWakeLock()">geolocation wake lock</a></li>
+ <li><a href="/en-US/docs/WebAPI/Using_geolocation" title="/en-US/docs/WebAPI/Using_geolocation">使用地理位置定位</a></li>
+ <li>该方法属于 {{domxref("Geolocation")}},可以通过 {{domxref("NavigatorGeolocation.geolocation")}} 访问。</li>
+ <li>取消监听的方法: {{domxref("Geolocation.clearWatch()")}}</li>
+ <li>另一个类似的方法: {{domxref("Geolocation.getCurrentPosition()")}}</li>
+</ul>