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我们在报表中使用了分组功能，或者在表头中使用了表达式的话，导出为CSV格式文件时会出现格式混乱的现象。
示例一：比如源文件分组预览效果为：
直接使用Csv 导出后，文件效果如下，格式混乱：
示例二：
源文件的表头中使用了表达式：
预览效果如下，根据参数不同显示不同的内容，但是始终显示两列。
而实际使用Csv 格式导出文件后，显示效果如下。并没有按照实际预览的效果，而是多出了两列。
此时我们只需要在导出时选择 Excel 数据 导出，然后设置中选择导出格式时选择 CSV 即可。
如此做后，即可导出预览效果的CSV文件。
示例一按照该方法导出后显示效果;
示例二按照该方法导出后的效果：
