ant-design/site/theme/template/utils.jsx

export function getMenuItems(data, locale) {
  const menuMeta = Object.keys(data)
          .map((key) => data[key])
          .map((item) => {
            const file = item.index || item;
            if (file.meta) {
              return file.meta;
            }
            return file[locale].meta;
          });

  const menuItems = {};
  menuMeta.sort((a, b) => {
    return parseInt(a.order, 10) - parseInt(b.order, 10);
  }).forEach((meta) => {
    const category = meta.category || 'topLevel';
    if (!menuItems[category]) {
      menuItems[category] = {};
    }

    const type = meta.type || 'topLevel';
    if (!menuItems[category][type]) {
      menuItems[category][type] = [];
    }

    menuItems[category][type].push(meta);
  });

  return menuItems;
}

export function ping(url, callback) {
  const img = new Image();
  let done;
  const finish = (status) => {
    if (!done) {
      done = true;
      img.src = '';
      callback(status);
    }
  };
  img.onload = () => finish('responded');
  img.onerror = () => finish('error');
  img.src = url;
  setTimeout(() => finish('timeout'), 1500);
}