变量必须与属性同名
let {name, age} = {name: 'wang', age: 22};
console.log(name, age); //wang 22
let {name} = {name: 'wang', age: 22};
console.log(name); //wang
let {sex} = {name: 'wang', age: 22};
console.log(sex); //undefined
真正被赋值的是后者，而不是前者
let {name: n,age: a} = {name: 'wang', age: 22};
console.log(n,a) //wang 22
嵌套
let people = {
msg : [
'Tom',
{family: ['son', 'daughter', 'wife']}
]
}
let { msg:[x,{ family }] } = people;
console.log(x,family) //Tom Array(2) ["son", "daughter", "wife"]
对象的解构赋值可以取到继承的属性
const tom = {};
const father = { height: 180};
Object.setPrototypeOf(tom, father);
const { height } = tom;
console.log(height); //180
指定默认值
let {x, y = 5} = {x: 1};
console.log(y); //5
// 默认值生效的条件是，对象的属性值严格等于undefined。
var {x = 3} = {x: undefined};
console.log(x); // 3
var {x = 3} = {x: null};
console.log(x); // null
转载于:https://www.cnblogs.com/guangzan/p/11268715.html
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