当清单事件被触发时，显示在清单顶端的页码。从1开始。
Page number of the page displayed at the top of the list for which a list event was triggered. Counting begins at 1.
当清单事件被触发时，显示在清单顶端的页码。
Page number of the page displayed at the top of the list for which a list event was triggered.
当清单事件被触发时，在清单页顶端显示的页顶端的列表行数。
Number of the list line displayed at the top of the page at the top of the list, for which a list event was triggered.
当清单事件被触发时，在清单页顶端显示的页顶端的列表行数。
Page number of the page displayed at the top of the list for which a list event was triggered.
当清单事件被触发时，在清单页顶端显示的页顶端的列表行数。
Page number of the page displayed at the top of the list for which a list event was triggered.
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