On the problem of this pointing in import js files

I print this in config.js and then introduce it in another file to print in the browser. I don"t know where this a came from.
I thought it was the vue scaffolding problem. The result of my execution on react scaffolding is the same.

Mar.11,2021

compilation tool converts es6 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-64f5-1e47d21-4399d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e47d21-4399d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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