var viewer = new Cesium.Viewer('cesiumContainer', {

      //Start in Columbus Viewer

      sceneMode : Cesium.SceneMode.COLUMBUS_VIEW,  // 设定3维地图的默认场景模式

      //Use standard Cesium terrain

      terrainProvider : new Cesium.CesiumTerrainProvider({    // 构建地形服务

      　　　　 url : '//cesiumjs.org/smallterrain',

      　　　　 credit : 'Terrain data courtesy Analytical Graphics, Inc.'

      }),

      *     //Hide the base layer picker

      *     baseLayerPicker : false,     // 设定基本图层提供不显示

      *     //Use OpenStreetMaps

      *     imageryProvider : new Cesium.OpenStreetMapImageryProvider({  // 调用openstreetmap瓦片服务

      *         url : '//a.tile.openstreetmap.org/'

      *     }),

      *     // Use high-res stars downloaded from https://github.com/AnalyticalGraphicsInc/cesium-assets

      *     skyBox : new Cesium.SkyBox({   // 设定近焦点和远焦点的x、y、z

      *         sources : {

      *           positiveX : 'stars/TychoSkymapII.t3_08192x04096_80_px.jpg',

      *           negativeX : 'stars/TychoSkymapII.t3_08192x04096_80_mx.jpg',

      *           positiveY : 'stars/TychoSkymapII.t3_08192x04096_80_py.jpg',

      *           negativeY : 'stars/TychoSkymapII.t3_08192x04096_80_my.jpg',

      *           positiveZ : 'stars/TychoSkymapII.t3_08192x04096_80_pz.jpg',

      *           negativeZ : 'stars/TychoSkymapII.t3_08192x04096_80_mz.jpg'

      *         }

      *     }),

      *     // Show Columbus View map with Web Mercator projection

      *     mapProjection : new Cesium.WebMercatorProjection()  // 设定投影坐标

      * });