code: function (jsonObj, cb) {
      if ($bc_$4.pN) {
        try {
          var params = jsonObj || {};
          params['callback'] = params['callback'] || $bc_$4._get_callback(function (obj) {
            cb && cb(obj);
          }, true);
          params['certificate'] = params['certificate'] || '';
  
          $bc_$4.pN.window.validCertificate(JSON.stringify(params));
        } catch (e) {
          console.error(e);
        }
      }
    }
docs: 本地验证证书的是否有效