请问为什么出现多个uid的时候，不同的uid生成的数据，轨迹线会连接在一起？-灵析社区

请教一下大佬们，我这么写会出现不同uid的数据，轨迹线会出现连接，要求的是不同的uid的连接是单独的。求大佬们帮忙解答一下~谢谢！  const onMessage = async (event) => { const data = JSON.parse(event.data); if (data.data == undefined || data.data.state !== undefined) { console.log('未响应'); return; } else { const uid = data.data.uid; // if (!polylineEntities[uid]) { initializePolyline(uid, positionParams); // 初始化轨迹线 } else { updatePolylinePosition(uid, positionParams); // 更新轨迹线位置 } } }; // 初始化创建新的轨迹线 let polylineEntities = {}; function initializePolyline(uid, positions) { polylineEntities[uid] = viewer.entities.add({ polyline: { positions: new Cesium.CallbackProperty(() => { return Cesium.Cartesian3.fromDegreesArray(positions.flatMap(pos => [pos.longitude, pos.latitude])); }, false), width: 5, distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 500), //设置可见距离 1000米可见 scaleByDistance: new Cesium.NearFarScalar(100, 100, 500, 100), //设置随图缩放距离和比例 material: Cesium.Color.RED, }, }); } // 更新轨迹线位置 function updatePolylinePosition(uid, positions) { const polylineEntity = polylineEntities[uid]; if (polylineEntity) { polylineEntity.polyline.positions = new Cesium.CallbackProperty(() => { return Cesium.Cartesian3.fromDegreesArray(positions.flatMap(pos => [pos.longitude, pos.latitude])); }, false); polylineEntity.polyline.show = checkedLines.value; } }