docs: function (dataType) {
          var task = getCurrentTask(this);
          if (task) {
              var data = task.context.data;
              return dataType == null ? data : data.getLinkedData(dataType);
          }
          else {
              // When series is not alive (that may happen when click toolbox
              // restore or setOption with not merge mode), series data may
              // be still need to judge animation or something when graphic
              // elements want to know whether fade out.
              return inner(this).data;
          }
      }