Javascript encounters floating point calculation problem

ask for advice, why does the problem of calculation results occur, and how to solve it?

let a = 1.1; 
a += 0.1*1; 
console.log(a);//1.2000000000000002
Mar.16,2021

you have said yourself why such a result occurred, solution

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-64f5-1e5342b-45221.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e5342b-45221.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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