I use document.execCommand to do the editor html inheritance problem

I use document.execCommand as the editor to insert the html element
, but when I wrap the line, I inherit the previous html element. I want another

. 
let model = "<div class="box">
234
</div>"
document.execCommand(https://segmentfault.com/ask"insertHTML", false, model);

for example, I insert a div. whose class is box. After a line break, a < div class="box" >

< / div > < / div >
is automatically generated. How can I add

to another line?
Javascript
Apr.07,2021

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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-64f5-1e475af-44c1d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e475af-44c1d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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