code: function normalizePages(result, pages, prefix) {
      let entryPageName;
      pages.forEach((item, idx) => {
          let filter;
          if (typeof item === 'object') {
              let {path, filter: pageFilter} = item;
              item = path;
              filter = pageFilter;
          }
  
          let {pageName, componentName} = getPageInfo(item, prefix);
          let pageInfo = {
              component: componentName
          };
          filter && (pageInfo.filter = filter);
          result[pageName] = pageInfo;
          if (idx === 0) {
              entryPageName = pageName;
          }
      });
  
      return entryPageName;
  }
docs: Normalize router page information
  
  @inner
  @param {Object} result the existed router pages
  @param {Array} pages the router pages to normalize
  @param {string=} prefix the page name prefix, optional
  @return {string} return the entry page name