Questions about how to write in the source code of vue

el?: string | Element what does this mean?

Aug.14,2021

static Type Checker
vue uses flow

typescript


if you are looking at version 2.+, you see the writing of Flow Click to view
as a type restriction:
question mark indicates that this parameter can be omitted.
string and Elelment are types (customizable)
..

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-64f5-1bf3e37-31ecc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf3e37-31ecc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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