//定义canvas屏幕点击事件，scene.canvas指的是HTMLCanvasElement元素，也就是屏幕画的东西
  var handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
  handler.setInputAction(function (event) {
    //event {position: position:{x:123,y:123}}
    // 转换为不包含地形的笛卡尔坐标
    let clickPosition = viewer.scene.camera.pickEllipsoid(event.position);
    // clickPosition{x: 101877.1201414885, y: 4637106.646197382, z: 4363390.89501216}
    // 转经纬度（弧度）坐标
    let radiansPos = Cesium.Cartographic.fromCartesian(clickPosition);
    // radiansPos{longitude: 1.6396749591249946, latitude: 0.7371487514224602, height:636749216566357e-9}
    // 转角度
    console.log(
      '经度：' +
        Cesium.Math.toDegrees(radiansPos.longitude) +
        ', 纬度：' +
        Cesium.Math.toDegrees(radiansPos.latitude)
    );
    //   // 添加圆点
    viewer.entities.add({
      position: clickPosition, //圆点位置
      point: {
        color: Cesium.Color.RED, //圆点颜色
        pixelSize: 20 //圆点大小
      }
    });
  }, Cesium.ScreenSpaceEventType.LEFT_CLICK);
  handler.setInputAction(function () {
    console.log('点击了中键');
  }, Cesium.ScreenSpaceEventType.MIDDLE_CLICK);
  handler.setInputAction(function () {
    console.log('双击了左键');
  }, Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
  handler.setInputAction(function () {
    //取消鼠标点击事件
    // handler.destroy()
    handler.removeInputAction(Cesium.ScreenSpaceEventType.RIGHT_CLICK);
  }, Cesium.ScreenSpaceEventType.RIGHT_CLICK);

  handler.setInputAction(function () {
    //取消鼠标点击事件
    handler.destroy();
    console.log('双击了右键，取消全部事件');
  }, Cesium.ScreenSpaceEventType.RIGHT_DOUBLE_CLICK);
});