Promise失败后重试

function fn() {
  const n = Math.random();
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (n > 0.7) {
        resolve(n)
      } else {
        reject(n)
      }
    }, 1000);
  })
}
Promise.retry = (fn, times) => {
  new Promise(async (resolve, reject) => {
    while (times--) {
      try {
        const res = await fn()
        console.log("success", res);
        resolve(res);
        break;
      } catch (error) {
        console.log('fail', error);
        if (!times) {
          reject(error)
        }
      }
    }
  }).catch((err) => {
    console.log("重试也失败了");
  })
}
Promise.retry(fn, 3)