1.JS的四种设计模式

1.工厂模式

function createPerson(name, age, sex) {
            const obj = new Object()
            obj.name = name;
            obj.age = age;
            obj.sex = sex;
            obj.sayHi = function () {
                console.log('this.name');
            }
            return obj;
        }

2.单例模式

    let OnlyPerson = function (name, age) {
            this.name = name;
            this.age = age;
        }
    OnlyPerson.prototype.sayHi = function () {
            console.log(this.name);
        }

    let getInstance = (
            function () {
                let Instance = null
                return function (name, age) {
                    if (!Instance) {
                        Instance = new OnlyPerson(name, age);
                    }
                    return Instance
                }
            })()

3.沙箱模式

  let sandbox = (function () {
            function sayName() { }
            function sayAge() { }
            return {
                sayName: sayName,
                sayAge: sayAge
            }
        })()

4.发布者订阅模式

let Public = {
            listen: function (key, fn) {
                if (!this.list[key]) {
                    this.list[key] = []
                }
                this.list[key].push(fn)
            },
            trigger: function (key, ...args) {
                let lists = this.list[key]
                for (let fn of lists) {
                    fn.apply(this, ...args)
                }
            },
            list: []
        }