Rock, Paper, Scissors game

rockpaperscissors.js

var userChoice = prompt("Do you choose rock, paper or scissors?");
var 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!"; 
    } else if (choice1 === "rock") {
        if (choice2 === "scissors") {
            return"Rock wins!";
        } else {
            return"Paper wins!";
        }
    } else if (choice1 === "paper") {
            if (choice2 ==="rock") {
                return"Paper wins!";
        } else {
            return"Scissors wins!";
        }
    } else if (choice1 === "scissors") {
            if (choice2 === "rock") {
                return"Rock wins!";
            } else {
                return"Scissors wins!";
        }
    }
};

compare(userChoice, computerChoice);