解构 - 三个点运算符

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

const a = [1,2,3],b = [4,5,6]
const c = [...a,...b]
console.log(c)

const [...arr] = ‘string‘

const [...div] = document.getElementsByTagName(‘div‘)

const obj = {
     *[Symbol.iterator](){
          yield 1
          yield 2
          yield 3
          yield 4
          yield 8
     }
}
console.log([...obj])

let {name,age,...other} = {name:‘zhangsan‘,age:18,job:‘前端开发‘,province:‘深圳‘}
console.log(name,age,other)

 const obj = {a:1,b:2}
 const o = {a:8,c:13,...obj}

 const obj1 = {a:12,b:23}
 const obj = {c:89,d:99}
 const newobj = {...obj1,...obj2}

const isTrue = true
const obj = {...(isTrue? obj1:obj2),c:33}

console.log({...[1,2,3]})
console.log({...‘string‘})

 function demo(a,b,...params){
     console.log(params)
 }
 demo(1,2,3,4,5,6)

function demo(...args){
      console.log(args)
}
const arr = [2,3,4,5]
demo.apply(null,arr)
demo(...arr)