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+---
+title: HTMLMediaElement.buffered
+slug: Web/API/HTMLMediaElement/buffered
+translation_of: Web/API/HTMLMediaElement/buffered
+---
+<div>{{APIRef("HTML DOM")}}</div>
+
+<p><strong><code>HTMLMediaElement.buffered</code></strong> 返回一个只读 {{domxref("TimeRanges")}} 对象 返回媒体已缓冲的区域</p>
+
+<div class="note"><strong>Note:</strong> This feature is not available in <a href="/en-US/docs/Web/API/Web_Workers_API">Web Workers</a>.</div>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox">var <em>timeRange</em> = <em>audioObject</em>.buffered</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>对象{{domxref("TimeRanges")}}</p>
+
+<p>length - 获得音频/视频中已缓冲范围的数量</p>
+
+<p>buffered.start 开始的区域 </p>
+
+<p>buffered.end 结束的区域</p>
+
+<h2 id="例子">例子</h2>
+
+<pre>var obj = document.createElement('video');
+console.log(obj.buffered); // TimeRanges { length: 0 }
+console.log(obj.buffered.start(0));//第一个缓存开始的区域
+console.log(obj.buffered.end(0));//第一个缓存结束的区域</pre>
+
+<h2 id="参考文档">参考文档</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('HTML WHATWG', "embedded-content.html#media-elements", "HTMLMediaElement.buffered")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>No change from {{SpecName('HTML5 W3C')}}</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5 W3C', "embedded-content-0.html#htmlmediaelement", "HTMLMediaElement.buffered")}}</td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+   <td>Initial definition.</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><code>buffered</code> property</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("2.0")}}</td>
+   <td>{{CompatIE("9")}}</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>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td><code>buffered</code> property</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile("2.0")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_Also" name="See_Also"><font><font>也可以看看</font></font></h2>
+
+<ul>
+ <li>The interface defining it, {{domxref("HTMLMediaElement")}}.</li>
+</ul>