说明
ES6 从入门到精通系列（全23讲）学习笔记。
扩展运算符
const arr = [1,2,3,4,66,8,9]; const maxNum = Math.max.apply(null, arr); console.log(maxNum);
es6 利用拓展运算符实现数组取最大值
const arr = [1,2,3,4,66,8,9]; const maxNum = Math.max(...arr); console.log(maxNum);
箭头函数
使用 => 来定义，function(){} 等于 () => {}
let add = function (a, b) { return a + b; } let add2 = (a, b) => { return a + b; } let add3 = (a, b) => a + b; console.log(add(1, 2)); console.log(add2(1, 2)); console.log(add3(1, 2));
返回对象：
let getObj = (val) => { return { name: "kaimo", value: val }; } let getObj2 = (val) => ({name: "kaimo", value: val}); console.log(getObj(313)); console.log(getObj2(666));
闭包函数：
let fn = (function() { return function() { console.log("hello es6"); } })(); let fn2 = (() => { return () => { console.log("hello es6 2"); } })(); console.log(fn()); console.log(fn2());
