How do I change the value of the java script variable when I press the html button?

Answer 1

https://code.sololearn.com/W00AP3GHfVU9/?ref=app 

Answer 2

I made this example for you. Play around with it and see if you can figure out how to find a solution to your question.

Answer 3

Ryan Els improved code:

https://code.sololearn.com/WTJEhsApoQ07/?ref=app