What is the problem with the property values of vue parent-child components?

when I am developing the list page and the list details page, the details page is a sub-component. In the details page, I get the data by calling the interface and then change a property value corresponding to the details page. In the parent component mounted () , I found console.log (me.$refs ["leaveapplydetail"]) print leavetype , but directly console.log (me.$refs [" leaveapplydetail"] .uploetype) has no value. Why?

Mar.12,2021

there is no value when you initialize, the value is added later; since me.$refs ['leaveapplydetail'] is an object, of course there is a value

when you look at it later.
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-64f5-1e493c8-444a5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e493c8-444a5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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