遇到问题：
①加载瓦片服务时，发现{TileRow}/{TileCol} 参数不对，刚好是等级大了一倍；
解决方法：tileMatrixLabels:["1","2","3","4","5","6","7","8","9","10","11"] ，注意是从1开始，不是从0开始。
加载wmts 主要代码如下：
var image = new Cesium.WebMapTileServiceImageryProvider({
url:"http://localhost:8880/geoserver/gwc/service/wmts/rest/arctest/{style}/{TileMatrixSet}/EPSG:4490_arctest:{TileMatrix}/{TileRow}/{TileCol}?format=image/png",
layer:'arctest',
format: "image/png",
style:'default',
tileMatrixSetID: 'EPSG:4490_arctest',
tileMatrixLabels:["1","2","3","4","5","6","7","8","9","10","11"],
tilingScheme:new Cesium.GeographicTilingScheme({
numberOfLevelZeroTilesX: 2,
numberOfLevelZeroTilesY: 1,
}),
});
//layer、tileMatrixSetID等参数需要根据自己的geoserver来做设置 localhost:8880/geoserver/gwc/service/wmts?REQUEST=getcapabilities，这里是所有wmts服务的参数列表，找到对应的图层配置即可
//添加到图层列表
viewer.imageryLayers.addImageryProvider(image);