返回按钮可以自行飞向自定义经纬度坐标

camera.flyTo({
            destination: Cartesian3.fromDegrees(101.88, 39.78,10000000)
          });

使用方法

 <script src="./node_modules/cesium-navigation/navigation.js"></script>

    Cesium.viewerCesiumNavigationMixin(viewer,{});