ECMAScript2016(ES7)

数组的include方法,返回false不存在,true存在

let arr = [1, 3, 5, NaN];
console.log(arr.includes(NaN));//true   includes在数组中能找到NaN
console.log(arr.indexOf(NaN));//false  indexOf在数组中找不着NaN

includes中+0等于-0

let arr =[+0];
console.log(arr.includes(-0));//includes中+0等于-0

类型数组也有includes方法

let tarr = Uint8Array.of(1,24,5,6);
console.log(tarr.includes(24));//true

指数运算符
**作为指数运算符
求2^3;

//console.log(Math.pow(2,3));//ES2015
let a = 2**3;
console.log(a);