How to know the properties in an interface

for example, there is an interface

interface a{
  ...  
}

how do I know what properties are in interface a

Dec.26,2021

you wrote it yourself. What are the attributes you don't know yet?

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-64f5-1e52b22-451e9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e52b22-451e9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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