如何实现错误重试

let retries = 0;
function load(ps: () => Promise<any>, onError?: (retry: Function, fail: Function, retries: number) => void) {
  // 拦截报错 将报错控制权交给onError回调
  return ps().catch((err) => {
    if (!onError) throw err;
    return new Promise((resolve, reject) => {
      // 重试函数
      const retry = () => {
        resolve(load(ps, onError));
        retries++;
      };
      // 失败函数
      const fail = () => {
        reject(err);
      };
      // 执行错误回调
      onError(retry, fail, retries);
    });
  });
}

// 模拟请求接口网络不好 需要请求5次才能成功
let count = 0;
const api = () => {
  return new Promise((resolve, reject) => {
    if (count < 5) {
      reject("网络异常");
    } else {
      resolve("请求成功");
    }
    count++;
  });
};

// 调用接口 增加重试逻辑
load(api, (retry, fail, retries) => {
  // 小于指定次数则重试
  if (retries < 5) {
    console.info("重试次数", retries);
    retry()
  } else {
    console.error(`超过重试次数 按照失败处理`);
    fail();
  }
});