选择性指定定位顺序中要选取控制项的方向。
Optionally specifies the direction in the tab order to select the control from.
索引是用来定位数据页的顺序指针或键的集合。
Indexes are collections of sequentially ordered Pointers or keys used for locating data pages.
它允许页面元素以某种顺序吸附到指定位置。
This allows your page elements to "snap" to positions in some sorted order.
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