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How to detect inactivity on web browser

This is something useful for apps which after a period of inactivity time you need to autosave things, clear localStorage, redirect to a logout URL and many other background things, so it does not matter if you are using VueJS or ReactJS you can add this code
<!-- Script -->
<script type='text/javascript'>
 
var inactivityTime = function () {
    var time;
    window.onload = resetTimer;
    // DOM Events
    document.onload = resetTimer;
    document.onmousemove = resetTimer;
    document.onmousedown = resetTimer; // touchscreen presses
    document.ontouchstart = resetTimer;
    document.onclick = resetTimer;     // touchpad clicks
    document.onscroll = resetTimer;    // scrolling with arrow keys
    document.onkeypress = resetTimer;
    window.addEventListener('scroll', resetTimer, true);
    let count = 0;
   
    function logout() {
          //localStorage.clear();
  //alert("You are now logged out.")
        //location.href = 'logout.html'
        //count++;
        //console.log(login OUT '+count);
       
    }

    function resetTimer() {
        clearTimeout(time);
        time = setTimeout(logout, 9000)
        // 1000 milliseconds = 1 second
    }
};



window.onload = function() {
  inactivityTime();
}


   </script>

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