Why it doesn't work?

Question

https://code.sololearn.com/WAODEl9J2Bs9/?ref=app

Answer 1

yes thanks

Answer 2

Sina you have to wrap the code inside an onload function.

window.onload = function(){
//your code here...
}

Here's a reference
https://www.sololearn.com/post/7444/?ref=app