Vue's question about adding new attributes to existing objects after an instance

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my question: why list is not defined in todos in data, but can be rendered

Apr.20,2021

mounted is the hook after the data has been mounted
beforeMount is definitely no problem to render

the second is because you trigger the update assignment of data data, and the list data is also monitored, so render

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-64f5-1e4bdee-44e7e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4bdee-44e7e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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