var myProviderViewModel = new Cesium.ProviderViewModel({
        name: "天地图地形",
        tooltip: "",
        iconUrl: "Widgets/Images/ImageryProviders/naturalEarthII.png",
        creationFunction: function () {
          tmsImageryProvider=new Cesium.UrlTemplateImageryProvider({
                  url : 'http://localhost/TianDiTu_dixing/{z}/{y}/{x}.png'
            })
          return tmsImageryProvider
        }
        });
        var viewer = new Cesium.Viewer('cesiumContainer',{
            selectedImageryProviderViewModel: myProviderViewModel,
                imageryProviderViewModels: [myProviderViewModel],
                terrainProviderViewModels: [],
        animation:false,
        timeline:false,
        geocoder: new myGeocoder()
        });

            //添加wmts图层
      var wmtsImageryProvider = new Cesium.WebMapTileServiceImageryProvider({
          url : 'http://localhost:8080/geoserver/gwc/service/wmts/rest/nurc:mosaic/{style}/{TileMatrixSet}/{TileMatrix}/{TileRow}/{TileCol}?format=image/png',
          layer : 'nurc:mosaic',
          style : 'raster',
          format : 'image/png',
          tileMatrixSetID:'EPSG:4326',
          tileMatrixLabels: _matrixIds,
          tilingScheme: new Cesium.GeographicTilingScheme({
            numberOfLevelZeroTilesX: 2,
            numberOfLevelZeroTilesY: 1
        })
      });
            viewer.imageryLayers.addImageryProvider(wmtsImageryProvider);

      //叠加wms图层
      const wmsImageryProvider = new Cesium.WebMapServiceImageryProvider({
        url: "http://localhost:8080/geoserver/topp/wms",
        layers: "topp:states",
        parameters: {
            transparent: true, 
            format: "image/png",
            srs: "EPSG:4326",
        },
      });
      viewer.imageryLayers.addImageryProvider(wmsImageryProvider);