定义

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功能

数组合并

const arr = [1,1,2,3]
const arr1 = [4,5,6]
const arr2 = [...arr,...arr1]
console.log(arr2)//[1,1,2,3,4,5,6]

数组克隆

const arr = ['a','s','d']
const arr1 = [...arr]//['a','s','d']

将伪数组转为真正的数组

const divs = document.querySelectorAll('div')
const divarr = [...divs]//[div,div,div]