code: function () {
              var self = this;
              if (!('packageInfo' in self)) {
                  var name = self.name;
                  // absolute path
                  if (startsWith(name, '/') ||
                      startsWith(name, 'http://') ||
                      startsWith(name, 'https://') ||
                      startsWith(name, 'file://')) {
                      self.packageInfo = null;
                      return;
                  }
                  var packages = Config.packages,
                      modNameSlash = self.name + '/',
                      pName = '',
                      p;
                  for (p in packages) {
                      if (startsWith(modNameSlash, p + '/') && p.length > pName.length) {
                          pName = p;
                      }
                  }
                  self.packageInfo = packages[pName] || packages.core;
              }
              return self.packageInfo;
          }
docs: Get the package which current module belongs to.
  @return {KISSY.Loader.Package}