对象与数组的解构、rest 操作符

1. 基本用法

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

2. 忽略部分值

var [a, , b] = [1, 2, 3];
console.log(a); // 1
console.log(b); // 3

3. 剩余模式

var [a, ...b] = [1, 2, 3];
console.log(a); // 1
console.log(b); // [2, 3]

4. 复合用法

const x = {
    name: 'yiluyanxia',
    skill: [
        {
            blueMagic: 'frozen'
        },
        {
            blueMagic: 'blaze'
        }
    ]
};

let {
    name: chineseName, // rename
    skill: [
        {
            blueMagic: skillName, // rename
        }
    ]
} = x;

console.log(chineseName); // "yiluyanxia"
console.log(skillName);  // "frozen"