increment jQuery val() not working

I have a function myTimer() which makes a counter. I want to increment input value when user clicks next button and repeat counter. The problem is every time it puts a new value of (rem) in input but I want to increase it by new rem. dur is a variable declared in myTimer() it's user entered to make count, and seconds the variable counted, it's declared in myTimer() too.

       var rem= 0;            
            rem+= dur-seconds-1;



You have declared JS variable var rem= 0; inside document.ready.

Declare it globally, before $(document).ready()

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