Javascript 石头、纸、剪刀游戏

Question

I have been working on this Rochambeau game in JavaScript and so far when I run it, it will prompt for user input but no matter what you input, the result is ALWAYS a tie. Here is my code:

 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"; } console.log("Computer: " + computerChoice); function compare(userChoice, computerChoice){ if(userChoice === computerChoice){ alert("The result is a tie!"); } else if(computerChoice === "scissors"){ alert("rock wins!"); if(computerChoice === "paper"){ alert("paper wins!"); } } else if(computerChoice === "rock"){ alert("rock wins!"); if(computerChoice === "scissors"){ alert("scissor wins!"); } } else if(computerChoice === "rock"){ alert("rock wins!"); if(computerChoice === "paper"){ alert("scissors wins!"); } } } compare();

Any idea why this isn't running the rest of the conditions?

Answer 1

You're not passing any parameters to the function. The parameters in the function will default to undefined . So undefined === undefined equals true. You should do this instead:

compare(userChoice, computerChoice);

Answer 2

compare();

Aren't you missing the parameters?