How to judge that this kind of object is empty?

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how many ways can you tell that this object is empty?

Apr.28,2022

var obj = {};
JSON.stringify(obj) === '{}' //true
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-64f5-1ec8b4b-2eee.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ec8b4b-2eee.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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