How can I add variables in my javascript code while iam running the code

Question

Make button which Says ''add'' that saves my input

Answer 1

Do you mean something like this?
https://stackoverflow.com/questions/38512034/add-value-of-button-into-input-field-on-button-click

Answer 2

You need to listen for click of button and than store input value.
Than inside listener you can create variable or just set value to already created variable.

https://code.sololearn.com/WTToHBmISFU9/?ref=app