写一段Cesium轨迹可视化的示例代码

示例代码：// 创建Cesium视图
var viewer = new Cesium.Viewer('cesiumContainer');// 加载KML文件
var kmlOptions = {
camera: viewer.scene.camera,
canvas: viewer.scene.canvas
};
Cesium.KmlDataSource.load('./sample.kml', kmlOptions).then(function(dataSource) {
viewer.dataSources.add(dataSource);
});// 设置轨迹可视化参数
var trajectoryOptions = {
width: 3,
material: Cesium.Color.BLUE
};// 加载轨迹
Cesium.GeoJsonDataSource.load('trajectory.geojson', trajectoryOptions).then(function(dataSource) {
viewer.dataSources.add(dataSource);
});