const obj = {
    id:123,
    age:20,
    name:"cyrus",
    school:"河北科技大学"
}

let obj1 = {
    age:18,
    ...obj,
    name:"李四"
}

console.log(obj1.age); //20
console.log(obj1.id); //123
console.log(obj1.name); //李四

const promise = new Promise((resolve, reject) => {
    console.log(1);
    resolve(3);
    console.log(2);
    reject(4)
})

promise.then((res) => {
    console.log(res);
}).catch(err=>{
    console.log(err);
})

console.log(5);

// 1 2 5 3

let name = Symbol(‘name‘)
let name1 = Symbol.for(‘name‘)
console.log(name == name1);// false

function * gen(){
    let params = yield 2
    let params1 = yield 3
    let params2 = yield params1 + 6
    let params3 = yield 7
    return params2 * params + params3
}
let lt = gen();
console.log(lt.next());// { value: 2, done: false }
console.log(lt.next(3)); // { value: 3, done: false }
console.log(lt.next(lt.next(1).value))// { value: 7, done: false }
console.log(lt.next(4));// { value: 25, done: true }

let obj = {name:"张三",age:16}
let proxy = new Proxy(obj,{
    get(target,property){
        if(target.age < 18){
            return "未成年人"
        } 
        return target[property]
    },
    set(target,property,value){
        if(property == ‘name‘&&target.age< 18){
            console.log("未成年人不允许改名字");
        }
        target[property] = value
    }
})
console.log(proxy.name);
proxy.name = "李四"
console.log(proxy.name);
proxy.age = 20
console.log(proxy.name);

//未成年人
//未成年人不允许改名字
//未成年人
//李四

let a=5;
let b=3;
[a,b]=[b,a]

console.log(a);
console.log(b);

let name = Symbol()

let obj = {
    name:"李白",
  [name]:"杜甫"
}

Reflect.ownKeys(obj).forEach(key=>{
  console.log(key);
    console.log(obj[key])
})

let list = [1,3,4,6,2,2,2,3,1,2,3,4]
let set = new Set(list)
let newList = Array.from(set)

// a.js
默认导出
const test = "测试"
export default {
    name:"李白",
  age:18,
  test
}

普通导出
export function getName(){
    console.log(123)
}

export const cat = "皮皮"

// b.js 

默认导入
import aObj from ‘./a.js‘
console.log(aObj.name) //李白


普通导入
import {getName,cat} from ‘./a.js‘
console.log(cat)
getName()

const list = [
    {id:3,name:"张三丰"},
    {id:5,name:"张无忌"},
    {id:13,name:"杨逍"},
    {id:33,name:"殷天正"},
    {id:12,name:"赵敏"},
    {id:97,name:"周芷若"},
]

console.log(list.filter(item => item.name.startsWith("杨")))
console.log(list.filter(item => item.name.includes("天")))
console.log(list.find(item => item.name == ‘周芷若‘).id)

const list = [
    {id:3,name:"张三丰"},
    {id:5,name:"张无忌"},
    {id:13,name:"杨逍"},
    {id:33,name:"殷天正"},
    {id:12,name:"赵敏"},
    {id:97,name:"周芷若"},
]

console.log(list.map(item=>({...item,id:item.id*2,updateTime:new Date()})));

const roleList = [{
    id: 1,
    name: ‘老板‘
}, {
    id: 2,
    name: ‘经理‘
}, {
    id: 3,
    name: ‘运营总监‘
}, {
    id: 4,
    name: ‘CEO‘
}, {
    id: 5,
    name: ‘销售‘
}, {
    id: 6,
    name: ‘实施‘
}, {
    id: 7,
    name: ‘程序员‘
}, {
    id: 8,
    name: ‘UI工程师‘
}, {
    id: 9,
    name: ‘产品经理‘
}];

// 用户已选择的数组
const selectedRoleList = [{
    id: 2,
    name: ‘经理‘
}, {
    id: 3,
    name: ‘运营总监‘
}, {
    id: 6,
    name: ‘实施‘
}, {
    id: 7,
    name: ‘程序员‘
}, {
    id: 9,
    name: ‘产品经理‘
}];


const unSelectedRoles = roleList.filter(item => !selectedRoleList.some(selectedItem => selectedItem.id == item.id))
console.log(unSelectedRoles);
const selectedIds = selectedRoleList.map(item=>item.id)
console.log(selectedIds);

        let obj = {
            name: "张三",
            age: 19
        }
                // 给对象添加迭代器
        obj[Symbol.iterator] = function () {
            let index = 0;
            let keys = Object.keys(this)
            return {
                next:()=> {
                    let value = {
                        key: keys[index],
                        value: this[keys[index]]
                    }
                    let done = index === keys.length;
                    index++
                    return {
                        value,
                        done
                    }
                }
            }
        }

        for (let item of obj) {
            console.log(item);
        }

 // 获取专题列表
function getSubject(){
    setTimeout(() => {
        let subjectList = [{subjectId:3,name:"专题"}]
    }, 1000);
}
// 获取课程列表，依赖专题id
function getCourseBySubjectId(subjectId){
    setTimeout(() => {
        console.log(subjectId);
        let courseList = [{courseId:4,name:"web前端课程"}]
    }, 1000);
}
// 获取课程详情，依赖课程id
function getCourseDetailById(courseId){
    setTimeout(() => {
        console.log(courseId);
        let courseDetail = {courseId:4,name:"web前端课程",intro:"这是一门很不错的课程"}
    }, 1000);
}

class Animal {
    constructor(name){
    this.name = name;
  }
  say(){
    console.log("动物说话了")
  }
}

class Dog extends Animal {
    constructor (name,color){
    super(name)
    this.color = color
  }
  
  say(){
    super.say()
    console.log(this.color+this.name+"叫了")
  }
}

const dog = new Dog("毛毛","金色")
dog.say()