js两个数组合并问题

Question

arr1 = [1,2,3];
arr2 = [a,b,c];
怎么得到合并得到[a,b,c,1,2,3],把数组二的元素插入到数组一

Answer 1

var arr1 = [1,2,3];
var arr2 = ['a','b','c'];

var result = arr2.concat(arr1)
console.log(result)

Answer 2

[...arr1,...arr2]

Answer 3

可通过数组的扩展运算符...
var arr1 = [1,2,3];
var arr2 = ['a','b','c'];

var result = [...arr2,...arr1]
console.log(result)