js 解构赋值

destructing.js

let arr = [5,6,7]
let [a] = arr // a: 5
let obj = {'age': 21, 'name': 'xzl'}
let {name, age} = obj // name: "xzl",age: 89
// 数组解构按顺序赋值，对象解构按key赋值