ES6扩展运算符

1. 扩展运算符写在左边，就是将剩余的数据打包到写的数组中

let brr = [1,2,3,4,5]
let [a,...b] = brr
console.log(a,b) // 1 [2,3,4,5]

    2.扩展运算符写在右边，就是将数组中的数据结构开

let arr = [6,7,8,9,10]
let brr = [1,2,3,4,5]
let crr = [...brr,...arr]
console.log(crr)//[1,2,3,4,5,6,7,8,9,10]

 3.写在函数的参数中

function add(...values){
    console.log(values)
}
add(10,20,30,40) //[10,20,30,40]