从 FeatureLayerView 查询要素

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view.whenLayerView(featureLayer).then(function(layerView) {
  // do something with the layerView
});

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layerView.watch("updating", function(value) {
  if (!value) {
    // wait for the layer view to finish updating

    // get all the features available for drawing.
    layerView
      .queryFeatures({
        geometry: view.extent,
        returnGeometry: true
      })
      .then(function(results) {
        // do something with the resulting graphics
        graphics = results.features;
      });
  }
});

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view.popup.open({
  features: [result],
  location: result.geometry.centroid
});