小技巧

let obj = {a:2,b:3}
let obj1 = {a:5, b:6}
let {a} = obj
let {a:a1} = obj1
console.log(a1)  //5
console.log(a)  //2

let {a:a1}将你得到的对应变量a改名为变量a1，但是变量a的值并不会改变，所以其实

let {a:a1}=obj1

就相当于把对应的a属性也换成了a1

let a1= obj.a1