H5 to determine whether the user has installed a certain app

h5 page to determine whether the user has a certain app on the phone. If so, click the button to download app, and ask how to implement it.

Jun.12,2021
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-64f5-1e9767b-165a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e9767b-165a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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