ES6

# 类

构造方法指定constructor，不是类名，只能写一次 this在类里面表示对象，在外面表示window

代码语言：javascript复制

<script>
        class Person {
            personName = "人类"
        }
        class User extends Person {
            userId = 'admin';
            userName = "管理员";
            constructor() {
                super()
            }
            run() {
                console.log("run")
                console.log(this.personName)
            }
            jump = function () {
                console.log("jump")
            }
            eat = () => {
                console.log('eat')
                console.log('usrName: '   this.userName)
            }
        }
        let u1 = new User()
        u1.run();
        u1.jump()
        u1.eat()
        let u2 = new User("zs", "张三")
        u2.run();
        u2.jump()
        u2.eat()
        const { userId, userName } = u1
        console.log(userId)
    </script>

# 解构

# 原型链

# 复制对象

代码语言：javascript复制

let user = {name:"李雷", age: 20}
let u = {...user}

# Promise

Promise.resolve({}) 继续执行 reject是拒绝

javascript node.js

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