How does WeChat Mini Programs set the bottom navigation for the sub-page itself?

WeChat Mini Programs, generally, the global tabBar is set through app.json to set the bottom navigation. Apart from customizing a fixed to the bottom, does the official provide the sub-pages to set the bottom navigation by themselves? Or other better methods ~

Oct.19,2021
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-64f5-1eb213d-23a7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eb213d-23a7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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