JS语法糖

1、数组复制

const arr1 = [1, 2, 3];
const arr2 = [...arr1];

2、字符串输出

const name = "apple";
const number = "2";
console.log(`name:${name}, number:${number}`); // name:apple, number:2 注意 "`"

3、class

class Human {
    constructor(name) {
        this.name = name;
    };
    getName() { console.log(this.name) };
}

4、Object解构

const group = {man:[1,3,5],woman:[2,4,6]};
const {man} = group;
console.log(man); // (3) [1, 3, 5]

5、数组解构

const arr1 = [1,2,3,4,5];
const [a,b,c,d,e] = arr1;
console.log(`${a},${b},${c},${d},${e}`)  // 1,2,3,4,5

6、遍历key值

const obj = {a:1,b:2,c:3};
for(let item in obj){
    console.log(item);
    console.log(obj[item]);
}

7、属性的简洁表示法

let listeners = []
function listen() {}
let events = {
  listeners: listeners,
  listen: listen
}

let listeners = []
function listen() {}
let events = { listeners, listen }

参考 & 引用

https://zhuanlan.zhihu.com/p/35746653

https://segmentfault.com/a/1190000010159725