Untitled

var number = Math.floor((Math.random()* 20) + 1);
var name = prompt("What is your name?")
var guess = prompt("Guess a number, 1 through 20")

if (guess == number){
  alert("You win " + name + "!");
} else {
  alert("You lose " + name + "!")
}


#index.html

<!DOCTYPE html>
<html>
  <head>
    <title>Guess the Number</title>
  </head>

  <body>
    <script src="guess_the_number.js"></script>
  </body>
</html>