1
let arr1 = [1,3,5],
2
    arr2 = [2,4,6]
3
let newArr = [...arr1,...arr2]

1
let arr1 = [1,3,5],
2
    arr2 = [2,4,6]
3
// forEach、map、filter、every、for、for in、for of等等
4
arr1.forEach(item => {
5
    arr2.push(item)
6
})

1
let arr1 = [1,3,5],
2
    arr2 = [2,4,6]
3
arr1.concat(arr2)

1
let arr1 = [1,3,5],
2
    arr2 = [2,4,6]
3
arr1.splice(arr.length, 0, ...arr2)