I would like to ask the Form form of iview, how to authenticate the formItem written in the subcomponents?

this is the parent component of the form
which introduces two child components
there are many formItem in each child component.
can be authenticated if it is written directly in the form without the use of subcomponents.
the question now is: how can I click the submit button of the parent component and also validate the form of the child component?
paste the code.
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Mar.18,2021

has been solved. Using prop to pass values, the child component can use the object passed by the parent component, and vue is not good at it.
paste the modified demo of the official iview example.

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-64f5-1bdd511-3135f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bdd511-3135f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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