How to use the aggregate function for table generated by elementUI v-for

because some of the fields are dynamic, I wrote a v-for to generate them circularly, but the result is that the aggregate functional parameters pass data that only writes dead columns and dynamically generates data that does not exist

.
<el-table-column ......></el-table-column>
<el-table-column v-for="(item, key) in header" :key=""total-rate" + key"
    :prop=""step_info." + key + ".mix""
    :label="item"
    width="158"
    show-overflow-tooltip sortable>
</el-table-column>

 getSummaries(param) {
                const { columns, data } = param;
                const sums = [];
 }

look forward to your advice, thank you

Apr.21,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e4477b-66459.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4477b-66459.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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