How to load different iframe pages with multiple button clicks?

the demand is like this, the left menu bar, the right content area, click a button to load an iframe page, click the next to load another iframe page, how to achieve? I don"t know much about iframe pages, thank you!

Feb.28,2021

first of all, if the subject says that he doesn't know anything about iframe, please attach the link W3C iframe

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the src attribute of iframe is mainly used here, so you should consider how to map your button to your iframe one by one.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e8ff24-129c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e8ff24-129c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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