The vue single-file component, after routing is configured, jumps to another component, but some js logic of the previous component is repeated

vue single-file component, after routing is configured, jump to another component, but some js logic of the previous component is executed repeatedly. How can we make the single-file js code for self-use only? how can css have a scope JS scope?

Mar.13,2021

how do you write your code

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-64f5-1b31cb0-2bda6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b31cb0-2bda6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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