Excuse me, what does this way of writing mean?



! This means that this must have a value


this is the typescript version of vue


shows the assignment assertion
reference


! Indicates the meaning of assignment

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-64f5-1b2b353-2ba75.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2b353-2ba75.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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