更改entity颜色

$.each(china_map_entities._children,function(i,obj){          
    if(viewer.entities.getById(obj.id).polygon){
        viewer.entities.getById(obj.id).polygon.material=Cesium.Color.GREEN.withAlpha(0.3)
    }
    if(viewer.entities.getById(obj.id).polyline){
        viewer.entities.getById(obj.id).polyline.material=Cesium.Color.WHITE.withAlpha(0.1)
    }
})

参考博客