//currentSelectIndex 当前选中Item在整个EndlessList中的Index
//CountDisplayed Endless所能显示的Item个数
//CorrectedValue PlaneCountDisplayed的一半,取整
//startIndex Endless要显示的第一个Item的Index
int startIndex = Mathf.Max(currentSelectIndex - CorrectedValue, 0);
if (dataList.Count >= CountDisplayed
&& currentSelectIndex >= dataList.Count - CorrectedValue)
startIndex = dataList.Count - CountDisplayed;
Scrollview.SetDataList(dataList, startIndex, currentSelectIndex);