使用方法：手握把手，将腿放在滚轮上前后滚动。
Use Method: Hold the handle with hands, put the leg on the rolling wheel and move back and forth.
这使表单的用户可以前后滚动查看repeat中的数据。
This allows the form's user to scroll back and forth through the data in the repeat.
这些方法使您的应用程序可以更新单个的列值，或者前后滚动结果集。
These enable your applications to update individual column values, or to scroll through result sets backward or forward.
下面的代码例示了这项功能，我在该代码中使用last()和previous()方法在数据间前后滚动。
This is exemplified with the code below, in which I use the last() and previous() methods to scroll backwards through the data.
如果列广泛地分散在控件中，这样做可能不太方便，尤其是在用户为了查看所有感兴趣的列而必须前后水平滚动时。
This can be inconvenient if the columns are widely separated in the control, especially if users must scroll back and forth horizontally in order to see all the columns they are interested in.
如果列广泛地分散在控件中，这样做可能不太方便，尤其是在用户为了查看所有感兴趣的列而必须前后水平滚动时。
This can be inconvenient if the columns are widely separated in the control, especially if users must scroll back and forth horizontally in order to see all the columns they are interested in.
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