在此页

• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

progress event is fired periodically as the browser loads a resource.

冒泡	No
可取消	No
接口	事件
事件处理程序特性	onprogress

范例

实时范例

HTML

<div class="example">
    <button type="button">Load video</button>
    <video controls width="250"></video>
    <div class="event-log">
        <label>Event log:</label>
        <textarea readonly class="event-log-contents"></textarea>
    </div>
</div>
					

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>label {
  display: block;
}
					

JavaScript

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', () => {
    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);
    }
});
					

结果

规范

规范	状态
HTML 实时标准 The definition of 'progress media event' in that specification.	实时标准
HTML5 The definition of 'progress media event' in that specification.	推荐

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
progress event	Chrome Yes	Edge ≤79	Firefox Yes	IE ?	Opera Yes	Safari ?	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android ?	Safari iOS ?	Samsung Internet Android Yes

图例

完整支持

完整支持

兼容性未知 ?

兼容性未知

另请参阅

• HTMLAudioElement
• HTMLVideoElement
• <audio>
• <video>

元数据

• 最后修改： Sep 10, 2019

相关话题

1. HTMLMediaElement
2. 特性

   1. audioTracks
   2. autoplay
   3. buffered
   4. controller
   5. controls
   6. controlsList
   7. crossOrigin
   8. currentSrc
   9. currentTime
   10. defaultMuted
   11. defaultPlaybackRate
   12. duration
   13. ended
   14. error
   15. initialTime
   16. loop
   17. mediaGroup
   18. muted
   19. networkState
   20. onerror
   21. paused
   22. playbackRate
   23. readyState
   24. seekable
   25. sinkId
   26. src
   27. srcObject
   28. textTracks
   29. videoTracks
   30. volume
3. 方法

   1. canPlayType()
   2. captureStream()
   3. fastSeek()
   4. load()
   5. msInsertAudioEffect()
   6. pause()
   7. play()
   8. seekToNextFrame()
   9. setMediaKeys()
   10. setSinkId()
4. 事件

   1. abort
   2. canplay
   3. canplaythrough
   4. durationchange
   5. emptied
   6. ended
   7. error
   8. loadeddata
   9. loadedmetadata
   10. loadstart
   11. pause
   12. play
   13. progress
   14. ratechange
   15. seeked
   16. seeking
   17. stalled
   18. suspend
   19. timeupdate
   20. volumechange
   21. waiting
5. 继承：

   1. HTMLElement
   2. 元素
   3. 节点
   4. EventTarget