AJS缓冲区叠加分析如何实现？

var params = new BufferParameters({

  distances: [560],

  unit: "kilometers",

  geodesic: true,

  bufferSpatialReference: new SpatialReference({wkid: 3857}),

  outSpatialReference: view.spatialReference,

  geometries: [webMerPoint]

});



geometryService.buffer(params).then(function(results){

  bufferLayer.add(new Graphic({

     geometry: results[0]

  }));

});