参考: https://www.jianshu.com/p/9e1e1e4c69f3

// 点击拾取功能:const dom = new DOM(document.querySelector("#UIContainer"));const handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);handler.setInputAction(movement => {var pick = viewer.scene.pick(movement.position);if (Cesium.defined(pick) && pick.primitive && pick.primitive instanceof Cesium.Billboard) {const info = pick.primitive.userData;dom.createInfo({name: info['保护区'],aqi: info['水质'],level: info['级别'],})} else {dom.close();}return false;}, Cesium.ScreenSpaceEventType.LEFT_CLICK);