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报表参数设置项中有一项为隐藏，当我们开启隐藏功能后，预览报表时将不再出现用户输入面板，而是直接使用默认数据进行数据查询。因此使用隐藏功能时必须为参数设置默认数据。
例如，我们在日期范围过滤的示例基础上，设置隐藏参数并设定开始时间的默认数据为2017/04/01；截止时间的默认数据为2017/04/30。这样就得到了一张2017年4月份的销售报表。
1. 设置报表参数“ 开始时间 ”，开启隐藏功能，并设置默认数据为“ 2017/04/01 ”。
2. 设置报表参数“ 截止时间 ”，开启隐藏功能，并设置默认数据为“ 2017/04/30 ”。
3. 为订购日期添加排序。
4. 预览，报表直接显示出了过滤数据，而不再出现参数输入面板。单击订购日期的排序按钮，可以看出数据为2017/4/1至2017/4/30之间的销售数据。
