Method add

src/mapboxgl/mapping/layers/GeojsonLayer.js:29–41

* @function GeojsonLayer.prototype.add * @param {Object} layer - Mapbox layer 地图对象。 * @param {string} beforeId - Mapbox GL 地图对象。

(layer, beforeId)

   * @param {string} beforeId - Mapbox GL 地图对象。
   */
  add(layer, beforeId) {
    const { id, source } = layer;
    this.layerId = id;
    if (this._existed()) {
      return;
    }
    if (typeof source === 'object') {
      const newData = this.eachData(cloneDeep(source.data));
      layer.source.data = newData;
    }

    this.map.addLayer(layer, beforeId);
  }

  /**
   * @function GeojsonLayer.prototype.remove