IViewState 
视图的(可序列化的)状态。
ts
interface IViewState {
    firstPosition: IPosition;
    firstPositionDeltaTop: number;
    scrollLeft: number;
    scrollTop?: number;
    scrollTopWithoutViewZones?: number;
}firstPosition 
- 类型: IPosition
firstPositionDeltaTop 
- 类型: number
scrollLeft 
- 类型: number
scrollTop 
- 类型: number
scrollTopWithoutViewZones 
- 类型: number
