问如何从geoserver请求WFS服务并将geojson数据作为一个层加载到as中？

EN

const geoJsonPromise = fetch('http://example.com/geoserver/wfs?service=wfs&version=2.0.0&request=GetFeature&typeNames=namespace:featuretype').then(res => res.json());

    const viewer = new Cesium.viewer('cesiumContainer');
    geoJsonPromise.then(geoJson =>
       viewer.dataSources.add(
         Cesium.GeoJsonDataSource.load(
            geoJson,
            { fill: Cesium.Color.PINK }
           )
       )
    );