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HTML

              
                <div>
  <div class="video-wrap">
    <video width="360" height="240" autoplay></video>
    <p>
      <button class="load-video">Load Video</button>
      <button class="play-video">Play</button>
      <button class="pause-video">Pause</button>
      <button class="seek-video">Seek +20s </button>
    </p>
  </div>
  <div class="console">
    Ready State: <span class="js-value"></span>
    <div class="events">
      <p>History State Change:</p>
      <div class="inner js-states"></div>
    </div>
  </div>
   <div class="console2">
    <div class="events">
      <p>History Events:</p>
      <div class="inner js-events"></div>
    </div>
  </div>
</div>  
              
            
!

CSS

              
                .video-wrap {
  float: left;
}
video {
  background: #000;
}
.console {
  float:left;
  margin-left: 20px;
  color: #fff;
  font-size: 12px;
  padding: 20px;
  width: 200px;
  height: 200px;
  background-color: green;
}

.console2 {
  float:left;
  margin-left: 20px;
  color: #fff;
  font-size: 12px;
  padding: 20px;
  width: 200px;
  height: 200px;
  background-color: red;
}

.inner {
  height: 150px;
  overflow:auto;
  font-size: 11px;
  color: #ddd;
}

.inner p {
  line-height: 14px;
  padding:0;
  margin: 0;
}
              
            
!

JS

              
                var videoSource = 'https://img-1252472236.cos.ap-beijing.myqcloud.com/%E3%80%904K%E3%80%91_72%20Seasons_%20of%20Makoto%20Shinkai%20%20%E6%96%B0%E6%B5%B7%E8%AA%A0%20%E3%80%8C%E4%BA%8C%E5%8D%81%E5%9B%9B%E7%AF%80%E6%B0%97%20%C2%B7%20%E4%B8%83%E5%8D%81%E4%BA%8C%E5%80%99%E3%80%8D.mp4';

var STATE = [
  'HAVE_NOTHING',
  'HAVE_METADATA',
  'HAVE_CURRENT_DATA',
  'HAVE_FUTURE_DATA',
  'HAVE_ENOUGH_DATA'
];

var loadStartTime = 0;

var appendStateChange = function (type, name) {
  var innerEl = document.querySelector('.js-states');
  var p = document.createElement('p');
  var str = ''
  if (type === 'action') {
    loadStartTime = Date.now();
    str = loadStartTime + ':' + name
  } else {
    str = '+' + (Date.now() - loadStartTime) + 'ms:' + name
  }
  if (!loadStartTime) {
    return;
  }
  p.innerText = str;
  innerEl.appendChild(p);
}

var currentState;
var videoEl = document.querySelector('video');
var readyStateInterval = function() {
  var valElm = document.querySelector('.js-value');
  if (currentState !== videoEl.readyState) {
    currentState = videoEl.readyState;
    appendStateChange('state', STATE[videoEl.readyState]);
  }
  valElm.innerText = STATE[videoEl.readyState];
}

const events = [
  'loadedmetadata',
  'loadeddata',
  'canplay',
  'canplaythrough',
]

events.forEach(function(item) {
  videoEl.addEventListener(item, function() {
    var innerEl = document.querySelector('.js-events');
    var p = document.createElement('p');
    var str = ''
    str = '+' + (Date.now() - loadStartTime) + 'ms:' + item;
     p.innerText = str;
    innerEl.appendChild(p);
  });
})






window.onload = function() {
  setInterval(readyStateInterval, 15);
  
  var loadbtn = document.querySelector('.load-video');
  loadbtn.onclick = function() {
    videoEl.src = videoSource;
    videoEl.load();
    appendStateChange('action', 'load');
  }
  
  var playBtn = document.querySelector('.play-video');
  playBtn.onclick = function() {
    videoEl.play()
    appendStateChange('action', 'play');
  }
  
  var pauseBtn = document.querySelector('.pause-video');
  pauseBtn.onclick = function() {
    videoEl.pause()
    appendStateChange('action', 'pause');
  }
  
  var seekBtn = document.querySelector('.seek-video');
  seekBtn.onclick = function() {
    videoEl.currentTime += 20
    appendStateChange('action', 'seek');
  }
}
              
            
!
999px

Console