mode_edit codeAPI / @angular/coreCollectionChangeRecordlinkinterface 已弃用弃用说明linkv4.0.0 - Use IterableChangeRecord instead.interface CollectionChangeRecord<V> extends IterableChangeRecord{ // 继承自 core/IterableChangeRecord get currentIndex: number | null get previousIndex: number | null get item: V get trackById: any }