let computer = 0; // 컴퓨터
let me = 0; // 사용자

const clickButton = (event) => {
  if (clickable) {
    (중략)
    if ([2, -1].includes(diff)) {

      me += 1;

      message = '승리';
    } else if ([-2, 1].includes(diff)) {

      computer += 1;

      message = '패배';
    } else {
      message = '무승부';
    }

    if (me === 3) {
      $score.textContent = `사용자의승리 ${me}:${computer}`;
    } else if (computer === 3) {
      $score.textContent = `컴퓨터의승리 ${me}:${computer}`;
    } else {
      $score.textContent = `${message} ${me}:${computer}`;