video.js使用改变ui过程

var myPlayer = videojs('my_video');
var c = myPlayer.controlBar.children();
console.log(c);

myPlayer.controlBar.removeChild(c[15]);
 var SBtn = myPlayer.controlBar.addChild('button');
 SBtn.addClass('vjs-fullscreen-control');
 SBtn.add
　　//在自定义的全屏button中添加id属性
 SBtn.setAttribute('id', 'fs');
 // 播放时处理的代码
 myPlayer.on('play', function(event) {
  event.preventDefault();
  /* Act on the event */
  played = true;
  console.log('play');
  $("#md-video-title").hide();
 });
 // 停止时要处理的代码
 myPlayer.on('pause', function(event) {
  event.preventDefault();
  /* Act on the event */
  played = false;
  console.log('play');
  $("#md-video-title").show();
 });
 $("#fs").on('click', function(event) {
  console.log("放大视频");
  $('#myModal').modal('toggle')
  $("#hide-container").after($("#my_video"));
  $("#my_video").css({
   width: '1140',
   height: '600',
   'border-color':'#ffffff'
  });
  if (played) {
   myPlayer.play();
  }
 });