antdVue 合并a-table相同内容行的方法！

 {
          title: "核算项",
          dataIndex: "hesxName",
          key: "hesxName",
          align: "center",
          customRender: (text, record, index) => {
            const obj = {
              children: text !== null ? text : "",
              attrs: {},
            };
            obj.attrs.rowSpan = this.mergeCells(
              text,
              this.cacheData.snapshot,
              "hesxName",
              index
            );
            return obj;
          },

 mergeCells(text, data, key, index) {
      // 上一行该列数据是否一样
      if (index !== 0 && text === data[index - 1][key]) {
        return 0;
      }
      let rowSpan = 1;
      // 判断下一行是否相等
      for (let i = index + 1; i < data.length; i++) {
        if (text !== data[i][key]) {
          break;
        }
        rowSpan++;
      }
      return rowSpan;
    },