有关字面量和解构赋值一点知识介绍

字面量（自变量）

 let name="wei";
 let age=3;
 let obj={
 //简写变量，等同于name:name
 name,
 age
 }
 console.log(obj.name)//wei
 let qqq = {
 name: 'wrs',
 toString () { // 'function' keyword is omitted here
 return this.name;
 }
 };


 console.log(qqq.toString()); // wrs

//通过对象字面量创建对象

 var human = {
 breathe() {
 console.log('breathing...');
 }
 };
 var worker = {
 __proto__: human, //设置此对象的原型为human,相当于继承human
 company: 'freelancer',
 work() {
 console.log('working...');
 }
 };
 human.breathe();//

解构赋值

允许提取数组和对象里的值，赋给变量。

function foo() {
 return [1,2,3];
}
let arr = foo(); // [1,2,3]

let [a, b, c] = foo();
console.log(a, b, c); // 1 2 3

function bar() {
 return {
 x: 4,
 y: 5,
 z: 6
 };
}
let {x: x, y: y, z: z} = bar();
console.log(x, y, z); // 4 5 6