const str="hello world";
const [a,b,...oth]=str;

const str="hello world";
const [...str1]=str;
const str2=[...str];
const str3=str.split("");

const str="hello world";
const {length,split}=str;

const {valueOf}=1;
const {toString}=true;

//取别名
const {valueOf:vo}=1;
const {toString:ts}=true;

function swap([a,b]){
    return [b,a];
}
let arr=[1,2];
arr=swap(arr);

 getInfo({
    name,age,friend1="cyy1",friend2="cyy2"
}){
    console.log(name);
    console.log(age);
    console.log(friend1);
    console.log(friend2);
}

无序传入参数
var obj={
    age:18    
}
getInfo(obj);