结构赋值是对数据结构进行拆分为变量，方便数据的操作

数组赋值

数组解构到变量中

let name=['Join','Smith']
let [firstName,lastName]=name

console.log(firstName) // Join
console.log(lastName)  // Smith

逗号忽略元素

let person=['张三','李四','王五']
let [one, ,three]=person

console.log(three) // 王五

使用Object.entries和结构赋值遍历键值对

let obj={
    name:'老八',
    age:22
}

for(let [key,vlaue] of Object.entries(obj)){
    console.log(key,value)
}

使用Map和结构赋值遍历键值对

let obj=new Map()
obj.set('name','老八')
obj.set('age','22')
for(let [key,value] of obj){
    console.log(key,value)
}

使用Rest方法接收

let person=['张三','李四','王五','老八','玖玖']
let [one,two,...Rest]=person

console.log(Rest)

默认值

let [name = "Guest", age = "12"] = ["Julius"];

console.log(name)
console.log(age)

对象解构赋值

let obj={a:{b:{c:1}}}

console.log(obj.a.b.c)  // 正常结解构赋值

let {a:{b:{c}}=obj  // 连续解构赋值
console.log(c)  

let {a:{b:{c:data}}}=obj  //解构赋值重命名
console.log(data)