<div class="mediaplayer">
  <div class="video">
    <video id="player" src="movie.mov" poster="mymovie.jpg"
    width="300" height="200">
    Video player not available.
    </video>
  </div>
  <div class="controls">
    <input type="button" value="Play" id="video-btn">
    <span id="curtime">0</span>/<span id="duration">0</span>
  </div>
</div>

window.onload=function(){
  var player = document.getElementById("player"),
  oBtn = document.getElementById("video-btn"),
  curtime = document.getElementById("curtime"),
  duration = document.getElementById("duration");
  //更新播放时间
  duration.innerHTML = player.duration;
  oBtn.onclick = function(){
    if (player.paused){
      player.play();
      oBtn.value = "Pause";
    } 
    else {
      player.pause();
      oBtn.value = "Play";
    }
  }
  //定时更新当前时间
  setInterval(function(){
    curtime.innerHTML = player.currentTime;
  }, 250);
}