Like Baidu, how is it realized at the front end of this function with toolbars and tagged pictures?

clipboard.png
Baidu"s custom character recognition can be selected in the box. How is it done with canvas? Is there a library like this that can be called

Apr.07,2021

there are many similar avatar upload libraries with box selection

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-64f5-1e449d7-59051.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e449d7-59051.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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