ES6解构

对象解构

const a = {id: 1, name: 'a1', age: 30};
const {id, ccc} = a;
const {name, ...ddd} = a;
console.log(id);    // 1
console.log(ccc);   // undefined
console.log(name);  // a1
console.log(ddd);   // {id: 1, age: 30}

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数组解构

const b = [1, 3, 5, 7, 9];
const [, eee] = b;
const [, ...fff] = b;
const [, , ...ggg] = fff;
console.log(eee);    // 3
console.log(fff);    // [3, 5, 7, 9]
console.log(ggg);    // [7, 9]