How to combine two arrays of objects into a single array and object using javascript

Question

I want to know how to merge two arrays of objects into a single array using javascript

var arr1 = [
  {编号:1, name: "xxx"}
]

var arr2 =[
 {详细信息：“财务”， 费用：“100”}
]

Tried.
var result1 = [...arr1, ...arr2];
var result=Object.assign({}, ...result1)

Expected output [ { Number: 1, Name: "xxx", Details: "Finance", Cost: "100" } ]

Answer 1

var arr1 = [
  {id:1, name: "xxx"}
]

var arr2 =[
 {details:"finance", cost:"100"}
]

const result = arr1.map((item, index) => ({ ...item, ...arr2[index] }))

console.log(result)