I need help in my basic Javascript code....

Question

I just write a simple program which will show a dialog box when user click on button .... but the program is showing an error....here is the link of my code

https://code.sololearn.com/WPCleQo9xxlm/?ref=app

Answer 1

Thanks, Your Answer is Very Helpfull

I am new in Javascript, Thats why i didn't understand much,
But this is really helpfull
I found my mistake....