lcm calculate in javascript

 <script>

var n1 = prompt("Enter the number");

var n2 = prompt("Enter the number");

let vishal = (n1 > n2) ? n1 :n2;

while(true){

if(vishal % n1 == 0 && vishal % n2 == 0){

alert(vishal);

break;

}

vishal++;

}

</script>