docs: function createContentLeftNumColRow(index) {
      var row = this.dataSourceObj.rows[index];
      var rootObj = row.value;
      var objAry = this.selectRows;
      var re = objCompare(rootObj, objAry);
      var htmlStr;
      var heightStr = '';
  
      if (!this.options.needResetHeight) {
          heightStr = 'height:' + (this.options.rowHeight + 1) + 'px;';
      }
      if (re) {
          htmlStr = '<div style="width:' + this.numWidth + 'px;' + heightStr + '" class="u-grid-content-num  u-grid-content-sel-row">' + (index + 1) + '</div>';
      } else {
          htmlStr = '<div style="width:' + this.numWidth + 'px;' + heightStr + '" class="u-grid-content-num">' + (index + 1) + '</div>';
      }
      return htmlStr;
  }