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+---
+title: 'HTMLMediaElement: progress event'
+slug: Web/API/HTMLMediaElement/progress_event
+translation_of: Web/API/HTMLMediaElement/progress_event
+---
+<div>{{APIRef}}</div>
+
+<p><strong><code>progress</code></strong> 事件在浏览器加载一个资源的时候周期性触发</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">Bubbles</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th scope="row">Cancelable</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th scope="row">Interface</th>
+   <td>{{domxref("Event")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">Event handler property</th>
+   <td><code>onprogress</code></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="在线示例">在线示例</h3>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;div class="example"&gt;
+
+    &lt;button type="button"&gt;Load video&lt;/button&gt;
+    &lt;video controls width="250"&gt;&lt;/video&gt;
+
+    &lt;div class="event-log"&gt;
+        &lt;label&gt;Event log:&lt;/label&gt;
+        &lt;textarea readonly class="event-log-contents"&gt;&lt;/textarea&gt;
+    &lt;/div&gt;
+
+&lt;/div&gt;</pre>
+
+<div class="hidden">
+<h4 id="CSS">CSS</h4>
+
+<pre class="brush: css">.event-log-contents {
+  width: 18rem;
+  height: 5rem;
+  border: 1px solid black;
+  margin: .2rem;
+  padding: .2rem;
+}
+
+.example {
+  display: grid;
+  grid-template-areas:
+              "button log"
+              "video  log";
+}
+
+button {
+  grid-area: button;
+  width: 10rem;
+  margin: .5rem 0;
+}
+
+video {
+  grid-area: video;
+}
+
+.event-log {
+  grid-area: log;
+}
+
+.event-log&gt;label {
+  display: block;
+}
+</pre>
+</div>
+
+<h4 id="JavaScript">JavaScript</h4>
+
+<pre class="brush: js">const loadVideo = document.querySelector('button');
+const video = document.querySelector('video');
+const eventLog = document.querySelector('.event-log-contents');
+let source = null;
+
+function handleEvent(event) {
+    eventLog.textContent = eventLog.textContent + `${event.type}\n`;
+}
+
+video.addEventListener('loadstart', handleEvent);
+video.addEventListener('progress', handleEvent);
+video.addEventListener('canplay', handleEvent);
+video.addEventListener('canplaythrough', handleEvent);
+
+loadVideo.addEventListener('click', () =&gt; {
+
+    if (source) {
+        document.location.reload();
+    } else {
+        loadVideo.textContent = "Reset example";
+        source = document.createElement('source');
+        source.setAttribute('src', 'https://interactive-examples.mdn.mozilla.net/media/examples/flower.webm');
+        source.setAttribute('type', 'video/webm');
+
+        video.appendChild(source);
+    }
+});</pre>
+
+<h4 id="结果">结果</h4>
+
+<p>{{ EmbedLiveSample('Live_example', '100%', '200px') }}</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', "media.html#event-media-progress", "progress media event")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5 W3C', "embedded-content-0.html#event-media-progress", "progress media event")}}</td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.HTMLMediaElement.progress_event")}}</p>
+
+<h2 id="也可以看看">也可以看看</h2>
+
+<ul>
+ <li>{{domxref("HTMLAudioElement")}}</li>
+ <li>{{domxref("HTMLVideoElement")}}</li>
+ <li>{{HTMLElement("audio")}}</li>
+ <li>{{HTMLElement("video")}}</li>
+</ul>