如何在Open Layers中创建内含图像的自定义控件？

class ImageControl extends ol.control.Control {
  constructor(options) {
    super(options);
    this.element = document.createElement('div');
    this.element.className = 'image-control';
    this.imageElement = document.createElement('img');
    this.imageElement.src = options.imageSrc;
    this.element.appendChild(this.imageElement);
  }
}

ImageControl.prototype.render = function(map) {
  ol.control.Control.prototype.render.call(this, map);
  return this.element;
};

var imageControl = new ImageControl({
  imageSrc: 'path/to/image.png'
});

var map = new ol.Map({
  // ...
  controls: ol.control.defaults().extend([imageControl])
});