React中关于使用map遍历绑定key值问题

再项目中使用baseUI时，根据文档构建视图,

但是数据用数组遍历时无非给<></> 绑定key值。出现index.js:1 Warning: Each child in a list should have a unique "key" prop.报错

 

 

const data: mockDataProps[] = [
  {
    menu: '项目管理',
    submenu: ['交互项目', '电子杂志'],
    role: [['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六']],
  },
  {
    menu: '付费管理',
    submenu: ['订单管理', '价格管理', '兑换码管理'],
    role: [['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六']],
  },
  {
    menu: '推广管理',
    submenu: ['推广管理'],
    role: [['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六']],
  },
  {
    menu: 'C端用户管理',
    submenu: ['C端用户管理'],
    role: [['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六']],
  },
  {
    menu: '讨论组管理',
    submenu: ['讨论管理', '评价管理'],
    role: [['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六'], ['张三', '李四', '王五', '赵六']],
  }
];

const MenuTab: React.FC = () => {
  const [css] = useStyletron();

  return (
    <Block>
      <Block className="search-form">
        <form>
          <Block className={css({
            display: 'flex',
          })}>
            <FormControlSmall label="一级菜单">
              <Select size={SELECT_SIZE.compact}></Select>
            </FormControlSmall>
            <FormControlSmall label="二级菜单">
              <Select size={SELECT_SIZE.compact}></Select>
            </FormControlSmall>
            <Block className={css({
              paddingTop: '44px',
            })}>
              <span className={
                css({
                  marginLeft: '4px',
                  marginRight: '12px',
                })
              }>
                <Button
                  onClick={() => alert("click")}
                  size={SIZE.compact}
                >
                  查询
                </Button>
              </span>
              <Button
                onClick={() => alert("click")}
                size={SIZE.compact}
              >
                重置
              </Button>
            </Block>
          </Block>
        </form>
      </Block>
      <Block className="search-table">
        <StyledRoot>
          <StyledTable>
            <StyledTableHeadRow>
              <StyledTableHeadCell>
                一级菜单
          </StyledTableHeadCell>
              <StyledTableHeadCell>
                二级菜单
          </StyledTableHeadCell>
              <StyledTableHeadCell>
                「查看」权限
          </StyledTableHeadCell>
              <StyledTableHeadCell>
                「新建」权限
          </StyledTableHeadCell>
              <StyledTableHeadCell>
                「修改」权限
          </StyledTableHeadCell>
              <StyledTableHeadCell>
                「删除」权限
          </StyledTableHeadCell>
            </StyledTableHeadRow>
            {data.map((row, rowIndex) => {
              return (
                <>
                  <StyledTableBodyRow key={rowIndex}>
                    <StyledTableBodyCell rowSpan={row.submenu.length++}>{row.menu}</StyledTableBodyCell>
                  </StyledTableBodyRow>
                  {row.submenu.map((submenu, submenuIndex) => {
                    return <StyledTableBodyRow key={`${submenuIndex}-${rowIndex}`}>
                      <StyledTableBodyCell>{submenu}</StyledTableBodyCell>
                      {row.role.map((item, index) => {
                        return <StyledTableBodyCell key={`${index}-${submenuIndex}-${rowIndex}`}><Tag>{item}</Tag></StyledTableBodyCell>
                      })}
                    </StyledTableBodyRow>
                  })}
                </>
              )
            })}
          </StyledTable>
        </StyledRoot>

      </Block>
    </Block>
  );
}

 

解决方案：

{data.map((row, rowIndex) => {               return (                 row.submenu.map((submenu, submenuIndex) => {                   return (                     [                       submenuIndex === 0 && (<StyledTableBodyRow key={rowIndex}>                         <StyledTableBodyCell rowSpan={row.submenu.length++}>{row.menu}</StyledTableBodyCell>                       </StyledTableBodyRow>),                       <StyledTableBodyRow key={`${submenuIndex}-${rowIndex}`}>                         <StyledTableBodyCell>{submenu}</StyledTableBodyCell>                         {row.role.map((item, index) => {                           return <StyledTableBodyCell key={index}><Tag>{item}</Tag></StyledTableBodyCell>                         })}                       </StyledTableBodyRow>                     ]                   )                 })               )             })}

 

原文地址：https://www.cnblogs.com/kangxinzhi/p/15134166.html