[建议]表格转Excel文件（xlsx）

因为用了iView Admin 里预设的表格转excel文件方法时，
都会出现「您正在尝试开启 'xxx.xls' ，其档案格式与副档名所指定的格式不同。开启档案之前，请确认档案未损毁，且来自信任的来源。您现在要开启档案吗?」，
后来找到下面网址提供的方法，使用之后才不会出现已上讯息，建议 iView Admin 可改用这个方法：
https://blog.csdn.net/lablenet/article/details/78271494

Start by locating iView Admin's preset table-to-Excel export method and compare its behavior with the approach described in the linked article. Done means the exported xlsx file opens without the reported format-and-extension warning.

Written by the indexing model from the issue text.