导出 KML

// 导出KML

var entity = viewer.entities.add({
  name: "My Point",
  position: Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
  point: {
    pixelSize: 10,
    color: Cesium.Color.RED,
  },
});

Cesium.exportKml({
  entities: viewer.entities,
}).then(function (res) {
  console.log(res);
  var blob = new Blob([res.kml], {
    type: "application/vnd.google-earth.kml+xml;charset=utf-8",
  });
  var url = URL.createObjectURL(blob);
  var link = document.createElement("a");
  link.href = url;
  link.download = "export.kml";
  // 触发下载
  link.click();
});