1羽峰、``反引號
eg：let a = "world";
`hello ${a} 睡雇！` 輸出為 hello world 污尉！
2坟乾、=>箭頭函數(shù)
eg: (x,y) => x+y;
(x,y) => {return x+y;}
3啃沪、數(shù)組新功能
1）定義
eg: let [a, b, c] = [1, 2, 3]
console.log(a,b,c)//輸出值為1,2,3
2）...
let arr = [2,3,4]
let arr2 = [1, ...arr, 5]
console.log(arr2)//輸出值為1,2,3,4,5
3）includes
let a = [1,2,3];
console.log( a.includes(2)) //輸出值為true
4）map
let a = [1, 3, 5];
let b = a.map((i) => i+1);
console.log(b) //輸出值為2,4,6
