Answer 1

string	必需。要被解析的字符串。
radix

Answer 2

Promise.retry = function (getPromise, num) {
  if (num === 1) return getPromise()
  return getPromise().then(res => res, () => Promise.retry(getPromise, --num))
}

Answer 3

https://www.cnblogs.com/yuliangbin/p/9348156.html