What is the principle of v-once?

after looking up the information for a long time, it is all about how to use it. How does it realize that it can be rendered only once?

Jun.20,2022

can be understood as a static string. (although not a string, it is a virtual dom).

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-64f5-1b3bdc2-2c2cf.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3bdc2-2c2cf.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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