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authorFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
commit310fd066e91f454b990372ffa30e803cc8120975 (patch)
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parent8260a606c143e6b55a467edf017a56bdcd6cba7e (diff)
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+---
+title: AudioContext.currentTime
+slug: Web/API/AudioContext/currentTime
+translation_of: Web/API/BaseAudioContext/currentTime
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<div>
+<p><code>currentTime是</code>{{ domxref("AudioContext") }}的一个read-only<code>属性,返回</code>double秒(从0开始)表示一个只增不减的硬件时间戳,可以用来控制音频回放,实现可视化时间轴等等。</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var audioCtx = new AudioContext();
+console.log(audioCtx.currentTime);</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>A double.</p>
+
+<h2 id="例子">例子</h2>
+
+<div class="note">
+<p><strong>注意</strong>:想要<em>完整的</em><em>Web Audio例子的话,</em>可以去<a href="https://github.com/mdn/" style="font-style: italic; background-color: rgba(231, 228, 157, 0.247059);">MDN Github repo</a>看DEMO(例如<a href="https://github.com/mdn/panner-node" style="line-height: 1.5; text-decoration: underline;">panner-node</a>)<span style="line-height: 1.5;">。</span><em>不妨试试在浏览器控制台输入</em><code style="font-style: italic; line-height: 1.5;">audioCtx.currentTime。</code></p>
+</div>
+
+<pre class="brush: js;highlight[8]">var AudioContext = window.AudioContext || window.webkitAudioContext;
+var audioCtx = new AudioContext();
+// Older webkit/blink browsers require a prefix
+
+...
+
+console.log(audioCtx.currentTime);
+</pre>
+
+<h2 id="规范">规范</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('Web Audio API', '#widl-AudioContext-currentTime', 'currentTime')}}</td>
+ <td>{{Spec2('Web Audio API')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<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 (WebKit)</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatChrome(10.0)}}{{property_prefix("webkit")}}</td>
+ <td>{{CompatGeckoDesktop(25.0)}} </td>
+ <td>{{CompatNo}}</td>
+ <td>15.0{{property_prefix("webkit")}}<br>
+ 22 (unprefixed)</td>
+ <td>6.0{{property_prefix("webkit")}}</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</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ <th>Chrome for Android</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatUnknown}}</td>
+ <td>26.0</td>
+ <td>1.2</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>33.0</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
+</ul>