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Calculate and put value to Child table in Web Form

Hello everyone,
I’m working with web form in erpnext, I can get value and put value to field, it’s easy like work with doctype.
But now I have to meet child table, need to calculate with it, I spent a lot of time to research but still cannot find anything relate with get and put value in child table WebForm. I tried to use JavaScript to put value to Child table but not working.
Anyone have knowages about this please help. thank a lot.