小游戏```jsconst player = document.getElementById('player'); co

const scoreElement = document.getElementById('score');
let velocity = 0;
let isJumping = false;
let score = 0;
let platforms = [];

// 初始化游戏
function init() {
  createPlatform(170, 100);
  gameLoop();
}

// 游戏主循环
function gameLoop() {
  velocity += 0.5; // 重力加速度
  let currentBottom = parseFloat(player.style.bottom) || 100;
  let newBottom = currentBottom - velocity;

  // 碰撞检测
  platforms.forEach(platform => {
    if (checkCollision(platform)) {
      velocity = -15; // 跳跃力度
      score += 10;
      scoreElement.textContent = `得分: ${score}`;
      generatePlatform();
    }
  });

  // 更新玩家位置
  player.style.bottom = `${newBottom}px`;

  // 游戏结束检测
  if (newBottom > 667) {
    alert(`游戏结束！最终得分: ${score}`);
    location.reload();
  }

  requestAnimationFrame(gameLoop);
}

// 创建新平台
function generatePlatform() {
  const lastPlatform = platforms[platforms.length - 1];
  const newX = Math.random() * 300;
  const newY = lastPlatform.y - 150;
  createPlatform(newX, newY);
}

// 绑定空格键事件
document.addEventListener('keydown', (e) => {
  if (e.code === 'Space' && !isJumping) {
    velocity = -12;
    isJumping = true;
    setTimeout(() => isJumping = false, 500);
  }
});

init();

// 辅助函数
function createPlatform(x, y) {
  const platform = document.createElement('div');
  platform.className = 'platform';
  platform.style.width = '60px';
  platform.style.height = '20px';
  platform.style.left = `${x}px`;
  platform.style.bottom = `${y}px`;
  document.querySelector('.game-container').appendChild(platform);
  platforms.push({x, y});
}

function checkCollision(platform) {
  const playerRect = player.getBoundingClientRect();
  const platformRect = document.querySelector('.platform').getBoundingClientRect();
  return !(playerRect.right < platformRect.left || 
         playerRect.left > platformRect.right ||
         playerRect.bottom < platformRect.top ||
         playerRect.top > platformRect.bottom);
}

<html>
<head>
  <title>跳一跳</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <div class="game-container">
    <div id="player"></div>
    <div id="score">得分: 0</div>
  </div>
  <script src="game.js"></script>
</body>
</html>

```body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #f0f0f0;
}

.game-container {
  position: relative;
  width: 375px;
  height: 667px;
  background: linear-gradient(135deg, #89f7fe 0%, #66a6ff 100%);
  overflow: hidden;
}

#player {
  position: absolute;
  width: 30px;
  height: 30px;
  background: #ff4757;
  border-radius: 50%;
  bottom: 100px;
  left: 172px;
  transition: transform 0.3s;
}

.platform {
  position: absolute;
  background: #2ed573;
  border-radius: 4px;
}