promise chain中的重试功能

function retry(fn, retries = 3, delay = 1000) {
  return new Promise((resolve, reject) => {
    fn()
      .then(resolve)
      .catch((error) => {
        if (retries === 0) {
          reject(error);
        } else {
          setTimeout(() => {
            retry(fn, retries - 1, delay).then(resolve).catch(reject);
          }, delay);
        }
      });
  });
}

// 示例异步操作
function asyncOperation() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (Math.random() > 0.5) {
        resolve('成功');
      } else {
        reject('失败');
      }
    }, 1000);
  });
}

// 使用重试功能
retry(asyncOperation)
  .then((result) => {
    console.log(result);
  })
  .catch((error) => {
    console.error(error);
  });