How to inject a global variable into webpack in vue-cli3.0

configure DefinePlugin, in vue.config.js as follows, but you cannot access the config variable in js. Thank you for all the answers ~
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Mar.21,2021
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-64f5-1e5f473-44d5e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e5f473-44d5e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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