footerConfig: {
    columns: [
     // ......
      {
        icon: 'https://gw.alipayobjects.com/zos/rmsportal/nBVXkrFdWHxbZlmMbsaH.svg',
        title: '更多产品',
        items: [
          {
            icon: 'https://gw.alipayobjects.com/zos/rmsportal/XuVpGqBFxXplzvLjJBZB.svg',
            title: '语雀',
            url: 'https://yuque.com',
            description: '知识创作与分享工具',
            openExternal: true,
          }
        ]
      }
    ],
  }