How do I use the open and close events of Element-ui 's navigation NavMenu?

I want to use this close event. I don"t know how to use the specified sub-menu, when I click.

Jul.01,2021

bind ref= "menu" on el-menu, and call this.$refs.menu.close (index)


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in the method.
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-64f5-1b320d0-2bdde.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b320d0-2bdde.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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