Why does the elementUI NavMenu component defaultActive method execute multiple times when the page is loaded?

Hello, everyone
I use vue+elementUI+webstorm to develop web navigation bar
I bind to el-menu: default-active method
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this defaultActive method I just defined in method, not in the hook function, why is the page loaded so many times? Under what circumstances will the defaultActive method be executed?

Mar.11,2021
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-64f5-1e44fa2-59b47.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e44fa2-59b47.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?