覆盖VideoJS PlayProgressBar

Question

我试图以一种使用自定义功能的方式覆盖VideoJs的一个组件：

video.js中的部分代码：

var PlayProgressBar = function (_Component) {
inherits(PlayProgressBar, _Component);

...

PlayProgressBar.prototype.update = function update(seekBarRect, seekBarPoint) {

...


 this.rafId_ = this.requestAnimationFrame(function () {
    var time = _this2.player_.scrubbing() ? _this2.player_.getCache().currentTime : _this2.player_.currentTime();

    var content = formatTime(time, _this2.player_.duration());
    var timeTooltip = _this2.getChild('timeTooltip');

    if (timeTooltip) {
      timeTooltip.update(seekBarRect, seekBarPoint, content);
    }
  });
};

return PlayProgressBar;


 }(Component);

兴趣点：

this.rafId_ = this.requestAnimationFrame(function () {
    var time = _this2.player_.scrubbing() ? _this2.player_.getCache().currentTime : _this2.player_.currentTime();

    var content = formatTime(time, _this2.player_.duration());
    var timeTooltip = _this2.getChild('timeTooltip');

    if (timeTooltip) {
      timeTooltip.update(seekBarRect, seekBarPoint, content);
    }
  });

兴趣点变化（CUSTOMFUNCTION）：

this.rafId_ = this.requestAnimationFrame(function () {
    var time = _this2.player_.scrubbing() ? _this2.player_.getCache().currentTime : _this2.player_.currentTime();

    var content = CUSTOMFUNCTION(time, _this2.player_.duration());
    var timeTooltip = _this2.getChild('timeTooltip');

    if (timeTooltip) {
      timeTooltip.update(seekBarRect, seekBarPoint, content);
    }
  });

我无法覆盖原始的video.js文件，所以我试图用

覆盖它

videojs.getComponent("PlayProgressBar").f...

但我没有成功。我该怎么办？