ES6解构赋值详解：数组与对象的高级用法及实战场景

let [a, b, c] = [1, 2, 3] // a=1, b=2, c=3
let [d, [e], f] = [1, [2], 3] // 嵌套数组解构 d=1, e=2, f=3
let [g, ...h] = [1, 2, 3] // 数组拆分 g=1, h=[2, 3]
let [i,,j] = [1, 2, 3] // 不连续解构 i=1, j=3
let [k,l] = [1, 2, 3] // 不完全解构 k=1, l=2

let {a, b} = {a: 'aaaa', b: 'bbbb'} // a='aaaa' b='bbbb'
let obj = {d: 'aaaa', e: {f: 'bbbb'}}
let {d, e:{f}} = obj // 嵌套解构 d='aaaa' f='bbbb'
let g;
(g = {g: 'aaaa'}) // 以声明变量解构 g='aaaa'
let [h, i, j, k] = 'nice' // 字符串解构 h='n' i='i' j='c' k='e'

var data = {userName: 'aaaa', password: 123456}
var userName = data.userName
var password = data.password
console.log(userName)
console.log(password)
var data1 = ['aaaa', 123456]
var userName1 = data1[0]
var password1 = data1[1]
console.log(userName1)
console.log(password1)

const {userName, password} = {userName: 'aaaa', password: 123456}
console.log(userName)
console.log(password)
const [userName1, password1] = ['aaaa', 123456]
console.log(userName1)
console.log(password1)

function personInfo(name, age, address, gender) {
 console.log(name, age, address, gender)
}
personInfo('william', 18, 'changsha', 'man')

function personInfo({name, age, address, gender}) {
 console.log(name, age, address, gender)
}
personInfo({gender: 'man', address: 'changsha', name: 'william', age: 18})

var a=1, b=2, c
c = a
a = b
b = c
console.log(a, b)

let a=1, b=2;
[b, a] = [a, b]
console.log(a, b)

function saveInfo(name, age, address, gender) {
 name = name || 'william'
 age = age || 18
 address = address || 'changsha'
 gender = gender || 'man'
 console.log(name, age, address, gender)
}
saveInfo()

function saveInfo({name= 'william', age= 18, address= 'changsha', gender= 'man'} = {}) {
 console.log(name, age, address, gender)
}
saveInfo()