只是两道简单题

Q1 纯css写个呼吸灯动画

@keyframes breathing {
  0% { opacity: 0.3; }
  50% { opacity: 1; }
  100% { opacity: 0.3; }
}

.breathing-light {
  width: 100px;
  height: 100px;
  background-color: yellow;
  animation: breathing 2s infinite;
}

Q2 用js写个函数要求随机一到三秒内返回一个promise对象，低于两秒成功，超过两秒失败

function randomPromise() {
  return new Promise((resolve, reject) => {
    const randomTime = Math.floor(Math.random() * 3000) + 1000; // 生成1到3秒之间的随机时间
    setTimeout(() => {
      if (randomTime < 2000) {
        resolve('成功');
      } else {
        reject('失败');
      }
    }, randomTime);
  });
}

// 测试示例
randomPromise()
  .then((result) => {
    console.log(result); // 成功
  })
  .catch((error) => {
    console.log(error); // 失败
  });