el-table 表格头部合并

 <el-table v-loading="listLoading" :key="tableKey" :data="list" stripe border fit highlight-current-row
            style="width: 100%;" size="mini">
            <el-table-column label="第一行" align="center">
                <af-table-column label="第二行" align="center" prop="zsGoodsCount" />
                <af-table-column label="第二行" align="center" prop="dxGoodsCount" />
                <af-table-column label="第二行" align="center" prop="dxl" />
            </el-table-column>
            <el-table-column label="第一行" align="center">
                <af-table-column label="商品加购数" align="center" prop="jgNum" />
                <af-table-column label="第二行" align="center" prop="xdCount" />
            </el-table-column>
        </el-table>

就是这样哟