JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" name="TextBox" id="TextBox" value="0" />
<input type="Button" id='AddButton' value="+" />

JavaScript

$(document).ready(function(){
        //var counter = $('#TextBox').val();
        $('#AddButton').click( function() {
            //this is not working
            $('#TextBox').val(parseInt($('#TextBox').val())++ );
            
            //this is working
            //$('#TextBox').val(parseInt($('#TextBox').val()) + 1 ); 
            
            //this works as well
            /*
            var counter = $('#TextBox').val() ; 
            counter++ ;
            $('#TextBox').val(counter);
            */
    });
});