internal constructor new Cesium.I3SField() This class implements an I3S Field which is custom data attached to nodes Members readonly header : object 获得此域头. readonly name : string 获得田名. readonly resource : Resource 获取字段的资源 readonly values : object 获取此字段的值. Methods load() → Promise.<void> 装入内容. Returns: 字段数据加载后解答的诺言