【解决办法】需设置subdomainConfig，示例代码如下：
var config = {
subdomainConfig: {
urlScheme: " http://{s}/iserver/services/3D-CBD/rest/realspace",
subdomains: ['localhost:8081', 'localhost:8082', 'localhost:8083']//设置子域
},
name: "building"
};
var promise = viewer.scene.addS3MTilesLayerByScp('http://localhost:8090/iserver/services/3D-CBD/rest/realspace/datas/building/config', config);
Cesium.when(promise, function (layer) {
viewer.flyTo(promise);
})
