function playGame(userChoice) {
  var choices = ["グー", "チョキ", "パー"];
  var computerChoice = choices[Math.floor(Math.random() * 3)];

  var result = Winner(userChoice, computerChoice);

  displayResult(userChoice, computerChoice, result);
}

function Winner(userChoice, computerChoice) {
  if (userChoice === computerChoice) {
    return "引き分け！";
  }

  if (
    (userChoice === "グー" && computerChoice === "チョキ") ||
    (userChoice === "パー" && computerChoice === "グー") ||
    (userChoice === "チョキ" && computerChoice === "パー")
  ) {
    return "勝ちました！";
  } else {
    return "負けました！";
  }
}

function displayResult(userChoice, computerChoice, result) {
  var resultElement = document.getElementById("result");
  resultElement.innerHTML = `
    <p>あなたの選択: ${userChoice}</p>
    <p>コンピュータの選択: ${computerChoice}</p>
    <p>${result}</p>
  `;
}