Rock,Paper, Scissors GAME

rockpaperscissors.js

var userChoice = prompt("Do you choose rock, paper or scissors?");
var computerChoice = Math.random();
if (computerChoice <= (1/3)) {
	computerChoice = "rock";
} else if(computerChoice <= (2/3)) {
	computerChoice = "paper";
} else {
	computerChoice = "scissors";
}
compare(userChoice,computerChoice);
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 === "scissors"){
        if(choice2 === "rock"){
            return "rock wins";
        }
        else{
            return "scissors wins";
        }
    }
};