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.
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