Not Working when with default No message Like if message = 0 is still display message (0) new Messages but i have Solution #178

<script>
   let num=0;

           function isClickR(){
            if(num>0){
              num--;
              if(num ===0){
                document.title= 'App';
             }
            }
           }
   
     setInterval(function () {
       if(num > 0){
      if ( document.title === 'App') {
        document.title = `(${num}) New Messages`;
      }else {
         document.title= 'App';
      }
    }
    }, 1000);
  

</script>