A simple Battleship game using javascript

This code snippet is about a game program in javascript which find out your accurancy within 6 guesses.This is implementation of conditional statement and a while loop in javascript

  Screenshot:

<script>
var rand = Math.floor(Math.random() * 5);

var location1 = rand;
var location2 = location1 + 1;
var location3 = location2 + 1;


var guess;
var hits = 0;
var guesses = 0;
var isSunk = false;


while(isSunk==false) {
 guess = prompt("Ready,aim,fire! (Enter a number 0-6):");
 if(guess < 0 || guess > 6) {
 alert("Please enter a valid number!");
 } else {
  guesses = guesses + 1;
  if(guess == location1 || guess == location2 || guess == location3) {
   alert ("HIT!");
   hits=hits+1;
   if(hits == 3) {
    isSunk = true;
    alert("You sank my battleship!");
   }
   }
   else {
    alert("MISS!");
   }
  }
}

var stats = "You took " +  guesses + " guesses to sink battleship, " + "your shooting accuracy was " + (3/guesses);

alert(stats);
</script>

Description:-
The first parameter of prompt() is the heading of program.
The alert checks whether you entered a correct value between 0-6 and it shows that you hit or miss the targets.Finally,it will show your result.

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