Echart's line chart hover to the inflection point does not show small palms?

echart"s line chart hover to the inflection point does not show the small palm? What is added to the Option object?

Mar.15,2022

`series: [{
cursor: "default",
.
}] `

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-64f5-1be0686-30c71.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be0686-30c71.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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