Method _removeLayers

src/openlayers/mapping/WebMap.js:175–197

* @private * @function WebMap.prototype._removeLayers * @description 移除叠加图层

()

   * @description 移除叠加图层
   */
  _removeLayers() {
    const map = this.map;
    this.layers.forEach(({ layerType, layer, labelLayer, pathLayer, dataflowService }) => {
      if (!layer) {
        return;
      }
      if (layerType === 'MIGRATION') {
        layer.remove();
        return;
      }
      if (layerType === 'DATAFLOW_POINT_TRACK' || layerType === 'DATAFLOW_HEAT') {
        // 移除轨迹图层
        pathLayer && map.removeLayer(pathLayer);
        // 取消订阅
        dataflowService && dataflowService.unSubscribe();
      }
      // 移除标签图层
      labelLayer && map.removeLayer(labelLayer);
      // 移除图层
      map.removeLayer(layer);
    });
    this.layers = [];
  }

  /**
   * @private