Ajax dataType VS responseType

what is the difference between dataType in Jquery Ajax and responseType in JS API? In the background, take PHP as an example, how to rewrite the front and back end code in the business?

Mar.14,2021
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-64f5-1b3b3b9-e7c8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3b3b9-e7c8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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