How to introduce jq? into the project built by vue-cli

After

is introduced in main.js, the use of $within the component is undefined and can only be reintroduced in the component.
in addition to referencing directly in index.html, how should I refer globally in main.js?

Jun.04,2021

main.js

  

pay attention not to type in when packing, as mentioned above, configure externals

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-64f5-1e62c92-45215.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e62c92-45215.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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