Promise.retry 函数实现

[zhongs]

const fetchData = (tryNum) => new Promise((resolve, reject) => {
  setTimeout(() => tryNum == -1 ? resolve('正确') : reject('发生错误'), 1000)
})

/**
 * 重试函数
 * @param 请求函数
 * @param 重试次数
 */
Promise.retry = async (fetchData, tryNum) => {
  try {
    return Promise.resolve(await fetchData(tryNum))
  }
  catch (err) {
    tryNum--
    return tryNum > 0 ? retry(fetchData, tryNum) : Promise.reject(err)
  }
}

Promise.retry(fetchData, 3).then(data => console.log('data', data)).catch(err => console.log('error', err))