code: function injectAsync(asyncList, content, usedSync, filePath) {
          if (asyncList.length === 0) {
              return content.replace(settings.resourceMapTag, '');
          }
          var subpath = settings.pageSubPath.replace('${index}', asyncCount).replace('{$hash}', fis.util.md5(filePath));
          var file = genAsyncMap(asyncList, subpath, usedSync, settings.codeGen);
          asyncCount++;
          return injectAsyncWithMap(content, file);
      }
docs: 注入异步资源，将会按页面生成异步资源表，并注入页面
  @param asyncList
  @param content
  @returns {*}