Specify the order in which the month gets the error for date in js

problem description

given a date, get the date within the next three months, but there is an error when given the date of November

related codes

/ / Please paste the code text below (do not replace the code with pictures) 

   


 which boss can explain?
Date javascript
Apr.20,2021

robust approach: 

  
 I remember that the month of js starts at 0. 0 represents January. Check out 
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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-64f5-16de67a-88ef.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-16de67a-88ef.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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