Vue project strange error report, there is no length in the project but reported "'length' of undefined" error! The error message is as follows

error message is shown in figure
clipboard.png

Jan.25,2022

what method of the array has been called


check where there is an array

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-64f5-1eb4137-24ac.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eb4137-24ac.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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