Question of JavaScript object = null

var obj1 = {test:"hello world"}
var obj2 = obj1
obj1 = null
alert(obj2.test)    // hello world

as far as I understand it, obj1 and obj2 point to the same object. Now obj1 is null,. Why can you still access test? through obj2?

Mar.26,2021

obj1 = null only overrides the direction of obj1, and obj2 still points to the original object, so it can still be accessed.

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-64f5-1b3576e-2bf8c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3576e-2bf8c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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