How does Tencent Map get rid of all marker

when using Tencent Map, I want to delete all the overlays on the map, but using the .setMap (null); method in the document does not work. How can I remove all the overlays on the map?

Mar.16,2021
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-64f5-1e3c270-58c16.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3c270-58c16.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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