myVid=document.getElementById("video1");
document.getElementById("span1").innerHTML=("Seeking: " + myVid.seeking);
<video id="video1" controls="controls" onseeking="isSeeking()" onseeked="isSeeking()">
<source src="/example/html5/mov_bbb.mp4" type="video/mp4">
<source src="/example/html5/mov_bbb.ogg" type="video/ogg">
Your browser does not support HTML5 video.
<p>试着在视频中寻址:<span id="span1"></span></p>