Rock, Paper, Scissors

HTML

<div id="myDiv">
</div>

CSS

#myDiv {
  font-weight:bold;
}

JavaScript

userChoice = prompt("Do you choose rock, paper or scissors?");
computerChoice = Math.random();
if (computerChoice < 0.34) {
	computerChoice = "rock";
} else if(computerChoice <= 0.67) {
	computerChoice = "paper";
} else {
	computerChoice = "scissors";
}
var compare = function(choice1, choice2) {
    if (choice1 === choice2) {
        return ("The result is a tie!");
    }
   if (choice1 === "rock") {
       if (choice2 === "scissors") {
           return ("rock wins.");
       } else {
           return ("paper wins.");
}
}
    if (choice1 === "paper") {
        if (choice2 === "rock") {
            return ("paper wins.");
        } else {
            return ("scissors wins.");
        }
    }
    if (choice1 === "paper") {
        if (choice2 === "scissors") {
            return ("scissors wins.");
        } else {
            return ("rock wins.");
        }
    }
    if (choice1 === "scissors") {
        if (choice2 === "rock") {
            return ("rock wins.");
        } else {
            return ("scissors wins.");
        }
    }
    if (choice1 === "scissors") {
        if (choice2 === "paper") {
            return ("scissors wins.");
        } else {
            return ("rock wins.");
        }
    }
    if (choice1 != "paper","scissors","rock") {
        return ("That is not a valid choice. Please input paper, scissors, or rock.");
    }
};
result = compare(userChoice, computerChoice);
document.getElementById("myDiv").innerHTML = result;