自定义 DynamicLayer

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const CustomWMSLayer = BaseDynamicLayer.createSubclass({
  properties: {
    mapUrl: null,
    mapParameters: null
  }
  // ...
});

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// Override getImageUrl() method to generate URL
// to an image for a given extent, width and height.
getImageUrl: function (extent, width, height) {
  const urlVariables = this._prepareQuery(this.mapParameters, extent, width, height);
  const queryString = this._joinUrlVariables(urlVariables);
  return this.mapUrl + "?" + queryString;
}