如何在xhr返回503时自动重新运行ajax调用

function retryAjax(url, maxRetries, retryInterval) {
  return new Promise(function(resolve, reject) {
    var retries = 0;

    function makeRequest() {
      $.ajax({
        url: url,
        success: function(response) {
          resolve(response);
        },
        error: function(xhr, status, error) {
          if (xhr.status === 503 && retries < maxRetries) {
            retries++;
            setTimeout(makeRequest, retryInterval);
          } else {
            reject(xhr);
          }
        }
      });
    }

    makeRequest();
  });
}

// 调用示例
retryAjax('https://example.com/api', 3, 1000)
  .then(function(response) {
    // 处理成功的响应
  })
  .catch(function(error) {
    // 处理错误
  });

function retryAjax(url, maxRetries, retryInterval) {
  return new Promise(function(resolve, reject) {
    var retries = 0;
    var timer;

    function makeRequest() {
      $.ajax({
        url: url,
        success: function(response) {
          resolve(response);
          clearTimeout(timer);
        },
        error: function(xhr, status, error) {
          if (xhr.status === 503 && retries < maxRetries) {
            retries++;
            timer = setTimeout(makeRequest, retryInterval);
          } else {
            reject(xhr);
          }
        }
      });
    }

    makeRequest();
  });
}

// 调用示例
retryAjax('https://example.com/api', 3, 1000)
  .then(function(response) {
    // 处理成功的响应
  })
  .catch(function(error) {
    // 处理错误
  });