How does the elementui table merge the last three columns of each row?

how does the elementui table merge the last three columns of each row? I saw api, but I still don"t know

5td

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Mar.16,2021

table has a span-method attribute, example of parallelism or columns on the official website

clipboard.png
arraySpanMethodcolumnIndex0rowspancolspancolspan3

update:
clipboard.png

columnIndex45rowspancolspan0:
clipboard.png


https://jsfiddle.net/2c5uedjb/1/


how to merge the last three and what functions you want to achieve.

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