Greeting

<script>
            var greeting;
            var name = true;
            var username = prompt("What's your name?");

            while(name){
                if(username != ""){
                    //greeting = "Welcome " + username;
                    alert("Greeting " + username);
                    name = false;
                    break;
                }
                else if(username == ""){
                    alert("Please enter your name");
                    username = prompt("What's your name?");
                }
            }
</script>