Cesium的api之关于viewer(二)

1、构建一个viewer，如下创建；options的参数根据实际情况，进行设定

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
     * });

var viewer = new