antd如何实现table表格的rowspan、colspan行列合并

表格在前端开发用的非常多，最近一直在用antdesign开发vue项目，有一个需求就是要实现表格行合并，查看官网发现实现table表格的rowspan、colspan行列合并的案例代码如下：

<template>
  <a-table :columns="columns" :data-source="data" bordered>
    <template slot="name" slot-scope="text">
      <a>{{ text }}</a>
    </template>
  </a-table>
</template>
<script>
// In the fifth row, other columns are merged into first column
// by setting it's colSpan to be 0
const renderContent = (value, row, index) => {
  const obj = {
    children: value,
    attrs: {},
  };
  if (index === 4) {
    obj.attrs.colSpan = 0;
  }
  return obj;
};

const data = [
  {
    key: '1',
    name: 'John Brown',
    age: 32,
    tel: '0571-22098909',
    phone: 18889898989,
    address: 'New York No. 1 Lake Park',
  },
  {
    key: '2',
    name: 'Jim Green',
    tel: '0571-22098333',
    phone: 18889898888,
    age: 42,
    address: 'London No. 1 Lake Park',
  },
  {
    key: '3',
    name: 'Joe Black',
    age: 32,
    tel: '0575-22098909',
    phone: 18900010002,
    address: 'Sidney No. 1 Lake Park',
  },
  {
    key: '4',
    name: 'Jim Red',
    age: 18,
    tel: '0575-22098909',
    phone: 18900010002,
    address: 'London No. 2 Lake Park',
  },
  {
    key: '5',
    name: 'Jake White',
    age: 18,
    tel: '0575-22098909',
    phone: 18900010002,
    address: 'Dublin No. 2 Lake Park',
  },
];

export default {
  data() {
    const columns = [
      {
        title: 'Name',
        dataIndex: 'name',
        customRender: (text, row, index) => {
          if (index < 4) {
            return <a href="javascript:;">{text}</a>;
          }
          return {
            children: <a href="javascript:;">{text}</a>,
            attrs: {
              colSpan: 5,
            },
          };
        },
      },
      {
        title: 'Age',
        dataIndex: 'age',
        customRender: renderContent,
      },
      {
        title: 'Home phone',
        colSpan: 2,
        dataIndex: 'tel',
        customRender: (value, row, index) => {
          const obj = {
            children: value,
            attrs: {},
          };
          if (index === 2) {
            obj.attrs.rowSpan = 2;
          }
          // These two are merged into above cell
          if (index === 3) {
            obj.attrs.rowSpan = 0;
          }
          if (index === 4) {
            obj.attrs.colSpan = 0;
          }
          return obj;
        },
      },
      {
        title: 'Phone',
        colSpan: 0,
        dataIndex: 'phone',
        customRender: renderContent,
      },
      {
        title: 'Address',
        dataIndex: 'address',
        customRender: renderContent,
      },
    ];
    return {
      data,
      columns,
    };
  },
};
</script>

效果如下：

更详细的可以去参考官网案例：官网案例
代码比较多，不是特别好理解，重点代码就在columns中的customRender，尤其是里面的index表示第几行，我这里使用时index拿不到值，但可以通过value.index获取索引，通过value.text获取该字段的值，用的时候如果出现问题，需要自己再去调试下。
比如下面就是我实现某1列的每两行就合并为1行的customRender部分TS代码：

customRender: (value:any) => {
    const obj = {
        children: value.text,
        attrs: {
            rowSpan:1
        },
    };
    if(value.index % 2 === 0){
        obj.attrs.rowSpan = 2;
    }
    if(value.index % 2 === 1){
        obj.attrs.rowSpan = 0;
    }
    return obj;
}