如何在javascript的每个for循环的每一行上执行一个数学函数?

I have a table wich is created by a forEach loop (loop through a database). what i'm trying to do is to calculate the price by multiplying qty x rate in each row. I have a javascript function(boqMath) to do this, but it only works for the first row(first loop). how can I change it to do this math for every rows(all loops)I have a table wich is created by a forEach loo