iview table 表头单元格合并

<Table border :columns="cusColumns" :data="cusData"></Table>
cusColumns： [
    {
      title: '门店/节点',
      align: 'center',
      // fixed: 'left',
      minWidth: 100,
      render: (h, params) => {
        // return h('span', params.row._index + 1);
        return h('span', this.orgName);
      }
    },
    {
      title: '性别',
      align: 'center',
      children: [
        {
          title: '男',
          key: 'genderOne',
          align: 'center',
          minWidth: 80,
        },
        {
          title: '女',
          key: 'genderTwo',
          align: 'center',
          minWidth: 80,
        },
        {
          title: '未知',
          key: 'genderZero',
          align: 'center',
          minWidth: 80,
        }
      ]
    }, 
    {
      title: '年龄',
      align: 'center',
      children: [
        {
          title: '19岁以下',
          key: 'ageOne',
          align: 'center',
          minWidth: 80
        },
        {
          title: '20-29岁',
          key: 'ageTwo',
          align: 'center',
          minWidth: 80
        },
        {
          title: '30-39岁',
          key: 'ageThree',
          align: 'center',
          minWidth: 80
        },
        {
          title: '40-49岁',
          key: 'ageFour',
          align: 'center',
          minWidth: 80
        },
        {
          title: '50岁以上',
          key: 'ageFive',
          align: 'center',
          minWidth: 80
        },
      ]
    }
  ]
  cusData: [{
  	genderOne: 2,
  	genderTwo: 3,
  	genderZero: 4,
  	ageOne： 11，
  	ageTwo： 12,
  	ageThree: 11,
  	ageFour: 123,
  	ageFive: 2323
  }]