when I write js code appendChild write in console cannot read this property what do I do?

Answer 1

https://code.sololearn.com/Wd8XFYqdF1ex/?ref=app

Answer 2

thank you ..the proplem is solved

Answer 3

https://code.sololearn.com/WxQz36CI3cdr/?ref=app

what about this wrong

Answer 4

really really ..thanks a lot bro