docs: function () {
              var messageTypes = this.data.messageTypes;
              var res = this.DEFAULT_ICON;
              var icons = this.ICONS;
              for (var i = 0, l = icons.length; i < l; i++) {
                  var curIcon = icons[i];
                  if (messageTypes[curIcon.type] > 0) {
                      res = curIcon.icon;
                      break;
                  }
              }
              return res;
          }