使用 onseeking 属性来指示 HTML 视频中的搜索处于活动状态。
<!DOCTYPE html>
<html>
<body>
<video controls onseeking = "display()">
<source src = "/html5/foo.ogg" type = "video/ogg" />
<source src = "/html5/foo.mp4" type = "video/mp4" />
Your browser does not support the video element.
</video>
<script>
function display() {
alert("Seeking starts!");
}
</script>
</body>
</html>
