解构 - 三个点运算符

1.数组-拆分 const arr =[1,2,3,4,5,6,7] const [a,b,...c] = arr console.log(a,b,c) 2.数组-合并 const a = [1,2,3],b = [4,5,6] const c = [...a,...b] console.log(c