js代码获取Cesium的czml数据

Demo举例：

2016年1月1日，北京16个区县24小时AQI数据的3D动画演变过程，Cesium1.16使用CZML数据显示动画的格式

[   {     "id" : "document",     "name" : "CZML Polygon - Intervals and Availability",     "version" : "1.0"   }, {"id":"huairouqu", "name":"怀柔区AQI", "availability":"2016-01-01T00:00:00Z/2016-01-02T00:00:00Z", "polygon":{"positions":{"cartographicDegrees":[116.6988,41.0213,0,116.6976,41.0189,0,116.6955,41.0155,0,116.6934,41.0137,0,116.6905,41.0126,0,116.6908,41.0103,0,116.6914,41.0079,0,116.6879,41.0042,0,116.6862,41.0023,0,116.6847,41.0019,0,116.6837,41.0015,0,116.6831,41.0002,0,116.6833,40.9993,0,116.6829,40.9981,0,116.6828,40.996,0,116.6829,40.995,0,116.6823,40.9945,0 …… 116.6521,41.0569,0,116.6546,41.0558,0,116.6571,41.0527,0,116.657,41.0513,0,116.6601,41.0495,0,116.6626,41.0485,0,116.6643,41.0476,0,116.6657,41.0467,0,116.6695,41.0463,0,116.6713,41.0458,0,116.6733,41.0464,0,116.6762,41.044,0,116.6777,41.0428,0,116.6803,41.0419,0,116.6841,41.0424,0,116.6891,41.0446,0,116.6911,41.0418,0,116.6922,41.0403,0,116.6913,41.0378,0,116.6925,41.0358,0,116.6944,41.0342,0,116.6959,41.0311,0,116.6952,41.0276,0,116.6966,41.0237,0]}, "material":{ "solidColor": {"color":[ {"interval":"2016-01-01T00:00:00Z/2016-01-01T08:00:00Z","rgba":}， {"interval":"2016-01-01T08:00:00Z/2016-01-01T19:00:00Z","rgba":}， ]         }       },       "perPositionHeight" : false,      "extrudedHeight":[{ "interval":"2016-01-01T00:00:00Z/2016-01-01T01:00:00Z","number":6900}, {"interval":"2016-01-01T01:00:00Z/2016-01-01T02:00:00Z","number":7300}, ……      ]     }   },   {     "id" : "miyunxian",     "name" : "密云县API",     "availability":"2016-01-01T16:20:00Z/2016-01-02T00:00:00Z",     "polygon" : {       "positions" : {         "cartographicDegrees" :  [116.88697199993148, 40.801070000005474 ,0,116.88699899969563, 40.80083600024426 …… 

由于坐标小数点后位数较多，数据文件较大，因此需要处理坐标

需要引入的js文件