es6解耦、模块化、promise
1、a.js文件
const hello = {
name:"zhangsan",
sex:"男",
eat(){
console.log("是个吃货");
}}
export default hello;
export let a = "Hello JS";
2、b.js
import {a} from './a.js'
import b from './a.js'
console.log(a);
b.eat();
3、运行
node b.js
4、Promise
new Promise((resolve, reject) => {
setTimeout(() => {
console.log('山东省')
resolve('山东省')
}, 2000)
}).then(res => {
console.log('这是第二个异步任务')
return new Promise((resolve, reject) => {
setTimeout(() => {
console.log(res + '日照市')
resolve(res + '日照市')
}, 2000)
})}).catch(err => {
console.log(err)})