apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/component/config/PortalConfig.java/PortalConfig/superAdmins
class PortalConfig:  public List<String> superAdmins() {
    String superAdminConfig = getValue("superAdmin", "");
    if (Strings.isNullOrEmpty(superAdminConfig)) {
      return Collections.emptyList();
    }
    return splitter.splitToList(superAdminConfig);
  }