<a-table
        ref="table"
        id="fixedTable"
        :rowKey="(record) => record.id"
        :pagination="false"
        :scroll="{ x: '100%', y: 400 }"
        @change="handlePageChange"
        :columns="columns"
        :dataSource="dataList"
      >

</a-table>

给table列表添加id。

// 更新fixed导致table里tr高度错乱问题
      this.$nextTick(() => {
        //table的id
        let tableId = "fixedTable";
        const scrollDiv = document.querySelector(
          `#${tableId} .ant-table-scroll > .ant-table-body`
        );
        const leftFixedDiv = document.querySelector(
          `#${tableId} .ant-table-fixed-left .ant-table-body-inner`
        );

        //表体tbody的tr高度，循环对每一行进行调整
        setTimeout(() => {
          this.dataList.forEach((item) => {
            //每一行的rowKey值，也就是<a-table>设置的rowKey
            let rowKey = item.id;

            const cssSelector = `table.ant-table-fixed tr[data-row-key='${rowKey}']`;
            // const rightFixedTr = rightFixedDiv.querySelector(cssSelector);
            const leftFixedTr = leftFixedDiv.querySelector(cssSelector);
            const scrollTr = scrollDiv.querySelector(cssSelector) as Element;
            const theoryTrHeight = getComputedStyle(scrollTr).height;

            leftFixedTr.style.height = theoryTrHeight;
            // rightFixedTr.style.height = theoryTrHeight;
          });
        }, 100);
      });

根据此博主的blog来做的记录：https://blog.csdn.net/qq_38118138/article/details/130622854