一次性加载

(method) DataSourceCollection.add(dataSource: Cesium.DataSource | Promise<Cesium.DataSource>): Promise<Cesium.DataSource>

const czml = [{id: "document",name: "CZML Point",version: "1.0",clock: {"interval": "2012-03-15T10:00:00Z/2012-03-15T18:00:00Z","currentTime": "2012-03-15T10:00:00Z","multiplier": 60,"range": "LOOP_STOP","step": "SYSTEM_CLOCK_MULTIPLIER"}},{id: "point_1",name: "point",label: {fillColor: {rgba: [255, 255, 255, 255],},font: "13pt Lucida Console",horizontalOrigin: "LEFT",pixelOffset: {cartesian2: [20, 0],},style: "FILL",text: "referencing fillColor",},position: {"interpolationAlgorithm": "LAGRANGE","interpolationDegree": 2,"referenceFrame": "INERTIAL","epoch": "2012-03-15T10:00:00Z",cartographicDegrees: [0, .0, .0, 12742000,2000, 20.0, .0, 12742000,4000, 40.0, .0, 12742000,6000, 60.0, .0, 12742000,8000, 80.0, .0, 12742000,10000, 100.0, .0, 12742000,12000, 120.0, .0, 12742000,14000, 140.0, .0, 12742000,16000, 160.0, .0, 12742000,18000, 180.0, .0, 12742000,],},point: {color: {rgba: [255, 255, 255, 255],},pixelSize: 5,},path: {"show": [{"interval": "2012-03-15T10:00:00Z/2012-03-15T15:00:00Z","boolean": true}],"width": 1,"material": {"solidColor": {"color": {"rgba": [255, 255, 255, 100]}}},"resolution": 120,leadTime: 0,trailTime: 1e10}
];const dataSourcePromise = Cesium.CzmlDataSource.load(czml)
viewer.dataSources.add(dataSourcePromise)
dataSourcePromise.then((dataSource) => {let point_1 = dataSource.entities.getById('point_1')
})

分段加载

可以通过CzmlDataSource.process实现分段加载

(method) CzmlDataSource.process(czml: Resource | string | any, options?: CzmlDataSource.LoadOptions): Promise<CzmlDataSource>

//创建并添加dataSource
const dataSource = new Cesium.CzmlDataSource();
viewer.dataSources.add(dataSource);
//保留dataSource原有数据，合并新数据
dataSource.process(czmlPath/part1.url)
dataSource.process(czmlPath/part2.url)

其中，part1应含有czml信息和完整的entity信息，part2包含czml信息和entity位置信息（和properties信息），proerties信息通过vehicleEntity.properties.fuel_remaining.getValue()方法获取，fuel_remaining为properties中的属性，定义为

"properties" : {"fuel_remaining" : {"epoch":"2012-08-04T16:00:00Z","number": [3000, 19.9]}
},