设计模式
(参考)[https://juejin.cn/post/6844904032826294286]
工厂模式
工厂模式定义一个用于创建对象的接口，这个接口由子类决定实例化哪一个类, 根据传入参数的不同创建元素
js
class Product {
constructor(name) {
this.name = name
}
log() {
console.log('ok')
}
}
class Factory {
create(name) {
return new Product(name)
}
}
let factory = new Factory()
let p = factory.create('p1')
p.log()单例模式
一个类只有一个实例，并提供一个访问它的全局访问点
js
class LoginForm {
constructor() {
this.state = 'hide'
}
show() {
if (this.state === 'show') {
alert('已经显示')
return
}
this.state = 'show'
console.log('登录框显示成功')
}
hide() {
if (this.state === 'hide') {
alert('已经隐藏')
return
}
this.state = 'hide'
console.log('登录框隐藏成功')
}
}
LoginForm.getInstance = (function () {
let instance
return function () {
if (!instance) {
instance = new LoginForm()
}
return instance
}
})()
let obj1 = LoginForm.getInstance()
obj1.show()
let obj2 = LoginForm.getInstance()
obj2.hide()
console.log(obj1 === obj2)适配器模式
将一个类的接口转化为另外一个接口
js
class Plug {
getName() {
return 'Lighting';
}
}
class Target {
constructor() {
this.plug = new Plug();
}
getName() {
return this.plug.getName() + ' 转Type-c';
}
}
let target = new Target();
target.getName()装饰者模式
js
class Cellphone {
create() {
console.log('手机')
}
}
class Decorator {
constructor(cellphone) {
this.cellphone = cellphone
}
create() {
this.cellphone.create()
this.createShell(cellphone)
}
createShell() {
console.log('手机壳')
}
}
let cellphone = new Cellphone()
cellphone.create()
let dec = new Decorator(cellphone)
dec.create()