将视图从 2D 切换到 3D

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// Switches the view from 2D to 3D and vice versa
function switchView() {
  const is3D = appConfig.activeView.type === "3d";

  // remove the reference to the container for the previous view
  appConfig.activeView.container = null;

  if (is3D) {
    // if the input view is a SceneView, set the viewpoint on the
    // mapView instance. Set the container on the mapView and flag
    // it as the active view
    appConfig.mapView.viewpoint = appConfig.activeView.viewpoint.clone();
    appConfig.mapView.container = appConfig.container;
    appConfig.activeView = appConfig.mapView;
    switchButton.value = "3D";
  } else {
    appConfig.sceneView.viewpoint = appConfig.activeView.viewpoint.clone();
    appConfig.sceneView.container = appConfig.container;
    appConfig.activeView = appConfig.sceneView;
    switchButton.value = "2D";
  }
}