How to highlight the echarts tag when clicked

example: http://echarts.baidu.com/exam.
how to keep the MarkPoint in this example highlighted after clicking

excuse me: how does echarts customize click or hover which data is highlighted and maintained?

May.26,2021

hover didn't do it, and then click styled the data separately


is there a solution

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-64f5-1b30504-2b480.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b30504-2b480.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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