How do mobile web pages listen for Backspace events?

Wechat web page, how to trigger the event when input triggers the backspace key?

found that it can be triggered if input has a value, how to trigger the Backspace key event when input has no value?

Sep.27,2021

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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-64f5-1bf3b91-31ea1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf3b91-31ea1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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