已经解决
Cesium.loadJson(url+'/scenes.json').then(function(scenes) {
var sname=scenes[0].name;
var cameraPosition=jsonData.camera;
var tilt=Cesium.Math.toRadians(cameraPosition.tilt - 90);
Cesium.when(promise,function(layer){
scene.camera.setView({
destination : new Cesium.Cartesian3.fromDegrees(cameraPosition.longitude,cameraPosition.latitude,cameraPosition.altitude),
orientation:{
heading:cameraPosition.heading,
pitch:tilt,
roll:0
}
});
}
});
});