How do different common components communicate with each other in the same interface?

excuse me, how do different common components communicate with each other using the same interface?

clipboard.png

for example, in the above figure, there are two common components in the two red boxes. When I click the Save button, I need to get the modified value in another common component. [question 1] how to get this?
[question 2] do I trigger the bus.$emit event if I use bus, @ change?
[question 3] is there another way?
just joined the pit, lack of actual combat experience, but also asked the gods to give advice one or two, thank you ~

Mar.23,2021

bus method, bus's pit is filled, see https://codeshelper.com/q/10.

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-64f5-1b3ef1a-2c449.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3ef1a-2c449.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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