SOURCE

//用 axios 封装一个请求库
// import axios from 'axios'
// const instance = axios.create({
//     baseURL:'',
//     timeout:5000
// })
// instance.interceptors.request.use(
//     config=>{
//         return config
//     },err=>{
//         return Promise.reject(err)
//     }
// )
// instance.interceptors.response.use(
//     res=>{
//         return res.data
//     },err=>{
//         return Promise.reject(error)
//     }
// )
// // GET 请求
// export const get = (url, params) => {
//   return instance.get(url, { params });
// };
// // POST 请求
// export const post = (url, data) => {
//   return instance.post(url, data);
// };


//手写观察者模式
class Observer {
    constructor() {
        this.listeners = []
    }
    notify(...args) {
        this.listeners.forEach((cb) => {
            cb.apply(this, args)
        })
    }
    subscribe(cb) {
        if (!(this.listeners.includes(cb))) {
            this.listeners.push(cb)
        }
    }
    unSubscribe(cb) {
        this.listeners = this.listeners.filter((item) => item !== cb)
    }
}
const ob = new Observer()
const test = (name) => { console.log('hello', name) }
ob.subscribe(test)
ob.unSubscribe(test)
ob.subscribe((name) => { console.log('world', name) })
ob.notify('ruijia')
//手写发布订阅模式
class EventEmitter {
    constructor() {
        this.eventList = {}
    }
    on(name, cb) {
        const flag = this.eventList[name]
        if (!flag) {
            this.eventList[name] = []
            this.eventList[name].push(cb)
        } else {
            this.eventList[name].push(cb)
        }
    }
    off(name, cb) {
        const flag = this.eventList[name]
        if (flag) {
            this.eventList[name] = this.eventList[name].filter((item) => item != cb)
        } else {
            throw TypeError('need')
        }
    }
    once(name, cb) {
        const request = function (...args) {
            cb.apply(null, args)
            this.off(name, cb)
        }
        this.on(name, request)
    }
    emit(name, ...args) {
        const flag = this.eventList[name]
        if (flag) {
            this.eventList[name].forEach((cb) => {
                cb.apply(null, args)
            })
        }
    }
}

//手写寄生组合继承
function SuperType(name){
    this.name = name
}
function SubType(name){
    SuperType.call(this,name)
    this.age = 20
}
SubType.prototype = new SuperType()
SubType.prototype.constructor = SubType