es6需要懂的技术

1、js内置对象 

对象中的扩展运算符(...)用于取出参数对象中的所有可遍历属性，拷贝到当前对象之中
//Object.assign({}, bar)

//去重——数组-对象-数组
Array.from(new Set([1,2,3,2]))
[...new Set([1,2,3,2])]

//并集
var a = new Set([1, 2, 3]);
var b = new Set([4, 3, 2]);
var union = new Set([...a, ...b]); // {1, 2, 3, 4}

//交集
var a = new Set([1, 2, 3]);
var b = new Set([4, 3, 2]);
var intersect = new Set([...a].filter(x => b.has(x))); // {2, 3}

//差集
var a = new Set([1, 2, 3]);
var b = new Set([4, 3, 2]);
var difference = new Set([...a].filter(x => !b.has(x))); // {1}

//对象解构赋值
var { name, age, id } = { id: "007", name: "Conan", age: 28 };
var { name: person_name, age: person_age, id: person_id } = { id: "007", name: "Conan", age: 28 };