code: function() {
          var colspan = this.options.column.length;
          $.each(this.options.column, function(index, col) {
              if (col.visible) {
                  colspan--;
              }
          });
          if (this.options.selectable) {
              colspan = colspan + 1;
          }
          this.$tableBody.find('tbody').append('<tr class="no-data"><td colspan="' + colspan + '">' + this.options.noDataContent + '</td></tr>');
      }
docs: 创建无数据提示行
  @private