关于数组 js

Question

letcolumns=["name","age","weight"]//里面的值是接口请求回来的，不固定有多少个的
letdata=[["jack",18,50],["jenny",22,60]]
letarr=[]
//最后结果我想要这样的
[
{"name":"jack","age":18,"weight":50},{"name":"jenny","age":22,"weight":60},{"name":"合计","age":40,"weight":110}
]
{"name":"合计","age":40,"weight":110}最后一个是age跟weight进行累积相加push到数组中