Canvas has text pictures, why is the picture from todataURL blank?

canvas has text pictures, why is the picture from todataURL blank?

Mar.11,2021

check whether the browser console has error

todataURL the picture is blank, and there will be error

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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-64f5-1e50896-450c4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e50896-450c4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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