JavaScript多个点号什么意思

// 数组
var number = [1,2,3,4,5,6]
console.log(...number) //1 2 3 4 5 6
//对象
var man = {name:'chuichui',height:176}
console.log({...man}) / {name:'chuichui',height:176}

//数组的复制
var arr1 = ['hello']
var arr2 =[...arr1]
arr2 // ['hello']
//对象的复制
var obj1 = {name:'chuichui'}
var obj2 ={...arr}
ob12 //  {name:'chuichui'}

//数组的合并
var arr1 = ['hello']
var arr2 =['chuichui']
var mergeArr = [...arr1,...arr2]
mergeArr  // ['hello','chuichui']
// 对象分合并
var obj1 = {name:'chuichui'}
var obj2 = {height:176}
var mergeObj = {...obj1,...obj2}
mergeObj // {name: "chuichui", height: 176}

var arr1 = [...'hello']
arr1 // ["h", "e", "l", "l", "o"]

function f(v,w,x,y,z){ }
var args = [2,3]
f(1,...args,4,...[5])

function f(x,y,z){}
var args = [1,2,3]
f(...args)

// 以前的方法
f.apply(null,args);