解构赋值

析构赋值写法

// 基础写法
var a = 1;
var b = 1; 

var person = new object();
person.name = "kaso";
person.age = 20;

//进阶写法
var 
    a = 1,
    b = 1;

var person = {
    name : "kaso",
    age : 20
}

// es6解构赋值

var [a, b] = [1,1];
var person = {name: 'xiaoliang', age: 15};

常用场景

1.两个变量交换值

// 传统写法
var x = 1;
var y = 2;
var k;

k = x;
x = y;
y = k;

// 解构赋值写法
var [x, y] = [1, 2];
[x, y] = [y, x]

2.快速获取当前页面域名与路径

var {hostname:host:domain, pathname:path} = location;

3.快速生成对象

var person = {
    name: "kaso",
    age: 20,
    money: 1000
}

function buildPerson({year, month, day, hour=0, minute=0, second=0}) {
    return new Date(year + '-' + month + '-' + day + ' ' + hour + ':' + minute + ':' + second);
}