                  const x = e.lngLat.lng * Math.PI / 180 * earthRad;
                    const a = e.lngLat.lat * Math.PI / 180;
                    const y = earthRad / 2 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));
                    document.getElementById('mouse-position').innerHTML = "X轴：" + x.toFixed(2) + "，Y轴：" + y.toFixed(2);
                });
                var mapExtent, mapLevel, startTime, endTime, geojson;
                startTime = currentTime = Date.parse(new Date('20