How does mxgraph support image export?

after editing the picture in mxgraph editor, can you provide api, to enable the picture to be exported in json or other format?

Mar.20,2021
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-64f5-1b2b534-2b2d4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2b534-2b2d4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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