react——Table组件

/*
* 构建数据列
* */
  tableColumns = (currentData) => {

    let group = lodashGroupBy(currentData, 'level1');
    console.log('group', group);
    return [{
      title: '统计事项一级目录',
      dataIndex: 'level1',
       '100px',
      key: 'level1',
      render: (value, row, index) => {
        if (!currentData.length || !currentData){
          return '';
        }
        if (index === 0){//处理第一行数据
          const obj = {
            children: value,
            props: {},
          };
          obj.props.rowSpan = group[value].length;
          return obj
        }
        if (index > 0  && currentData[index-1].level1 === value){ //判断当前的值和前面一个值是否相等，如果相等则设置obj.props.rowSpan = 0;
          const obj = {
            children: value,
            props: {},
          };
          obj.props.rowSpan = 0;
          return obj
        }else {
          const obj = {
            children: value,
            props: {},
          };
          obj.props.rowSpan = group[value].length;
          return obj
        }
      },
    }, {
      title: '统计事项二级目录',
      dataIndex: 'level2',
       '100px',
      key: 'level2'
    }].concat(this.dynamicMonth(this.state.startMonth, this.state.endMonth));
  };