How to judge the status of the network in APP? Can it be judged directly by js?

navigator.onLine

window.addEventListener ("online",function () {});

all of this has been tried, but it only works in mobile browsers. If app has gone in but suddenly disconnected, it cannot be detected.

Mar.15,2021
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-64f5-1eaf21a-222d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eaf21a-222d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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