Vue mobile phone navigation click one to control the current level 2 display and, click again, let the current level 2 hide

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indexdataindex

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the problem now is, for example, if I want to click on "Apps and products" and find that the secondary navigation cannot be recovered, there will always be a display

Sep.04,2021

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index

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function is implemented

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-64f5-1e87758-e5b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e87758-e5b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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