JavaScript setTimeout Example

<div id="output"></div>

<style>
        #output{
            width: 200px;
            word-wrap: break-word;
        }
</style>

<script>
document.addEventListener('DOMContentLoaded',(e)=>{  
   
      let output=document.querySelector("#output");
      (function timer() {        
          setTimeout(function(){
            let min=1;
            let max=10;
            let rand=Math.floor(Math.random() * (max - min) ) + min;
            output.innerHTML+=rand;

            timer();
          }, 100);        
      })();      

    });
</script>

<div id="timer"></div>
    <script>
        document.addEventListener('DOMContentLoaded',(e)=>{  
 
 (function timer() {        
     setTimeout(function(){

       let min=1;
       let max=10;
        
       let time=document.querySelector("#timer");
       let d=new Date();
       time.innerHTML=`${d.getHours()}:${d.getMinutes()}:${d.getSeconds()}`;

       timer();
     },1000);        
 })();      

});
    </script>