es6使用小技巧

①模板字符串拼接字符``

`${name}小朋友，欢迎你加入${school}`

name和school皆为变量

②定义变量，使用const和let来代替var，避免变量上升，污染全局变量

③合并对象：展开运算符

const obj1 = { a: 1, b: 2 };
const obj2 = { c: 3, d: 4 };
const obj = { ...obj1, ...obj2};

使用 Object.assign()

const obj1 = { a: 1, b: 2 };
const obj2 = { c: 3, d: 4 };
const obj = Object.assign({}, obj1, obj2);
console.log(obj); // 输出：{a: 1, b: 2, c: 3, d: 4}

注意两者区别，和深浅拷贝问题

④解构赋值

const user = {
  name: 'LiHua',
  age: 18,
  sex: 'male',
  address: 'Shanghai'
};


const { name, age } = user; // LiHua 18

⑤语法糖async/await使用

async function getData() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve('data');
    }, 3000);
  });
}

async function fetchData() {
  const data = await getData();
  console.log(data);//3后打印
}

fetchData();