Why not directly use app to access the contents of the parent element obtained by the vue child component?

like A
where a child component needs to access the parent element, I need to use prop
after reading the tutorial, but why not use app.A directly in the child component?

Mar.17,2021

this is a way to avoid confusion in class relations and to keep organized in order to follow.

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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-64f5-1ed161c-3348.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ed161c-3348.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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