docs: function getSumValue(field, gridCompColumn, gridComp) {
      var sumValue = null;
      if (gridCompColumn.options.sumCol) {
          $.each(this.rows, function (i) {
              var v = $(this.value).attr(field);
              if (gridCompColumn.options.dataType == 'Int') {
                  v = gridComp.getInt(v, 0);
                  sumValue += parseInt(v);
              } else {
                  v = gridComp.getFloat(v, 0);
                  sumValue = gridComp.accAdd(sumValue, parseFloat(v));
              }
          });
      }
      // 处理精度
      if (gridCompColumn.options.dataType == 'Float' && gridCompColumn.options.precision) {
          var o = {};
          o.value = sumValue;
          o.precision = gridCompColumn.options.precision;
          sumValue = gridComp.DicimalFormater(o);
      }
      if (sumValue != null && sumValue != undefined && sumValue != 'null' && sumValue != 'undefined') {
          return sumValue + '';
      } else {
          return '';
      }
  }