To introduce the use of vue.js CDN (non-vue-cli), can you use these guard functions of beforeRouteLeave?

I want to modify the page of the previous project, but it is not developed in vue-cli. Can I use the guardian functions of beforeRouteLeave if I directly introduce the cdn of vue now?

Apr.07,2021

but that's what vue-router says. Cdn can be used, the same.

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-64f5-1b3f491-2bbf9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3f491-2bbf9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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