ES6中解构赋值的使用讲解

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

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

let [a, , ...c]=[1,2,3,4,5]
console.log(a) // 1
console.log(c) // [3,4,5]

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

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

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

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

let [,match]="hello world".match(/h(e)/) 
// 匹配的结果是 ["he", "e", index: 0, input: "hello world", groups: undefined]

console.log(match) // 'e'

let {a, b}={a:1,b:2}
console.log(a) // 1
console.log(b) // 2

let {a,...b}={a:1,b:2,c:3}
console.log(a) // 1
console.log(b) // {b:2,c:3}

let {a, b, c}={a:1,b:2}
console.log(a) // 1
console.log(b) // 2
console.log(c) // undefined

let {a, b, c=3}={a:1,b:2}
console.log(a) // 1
console.log(b) // 2
console.log(c) // 3

let {a:aa, b:bb}={a:1,b:2}
console.log(aa) // 1
console.log(bb) // 2

let {a:aa, b:bb, c:cc=3}={a:1,b:2}
console.log(aa) // 1
console.log(bb) // 2
console.log(cc) // 3

let {name, books:[book]}={name:"haha",books:['book1']}
console.log(name) // 'haha'
console.log(book) // 'book1'

for(let {name} of [{name:1},{name:2}]){
    console.log(name) // 1 2
}

let register({name, pwd}){
    console.log(name, pwd)
}
register({name:'1',pwd:'2'}) //1,2

let a,b
({a, b}={a:1,b:2}) // 需要提升优先级，否则 {a, b} 会被解析成代码块
console.log(a, b)// 1, 2