关于javascript:发布订阅模式

定义：公布/订阅与观察者模式原理差不多，都是定义一对多的依赖关系，当相干状态更新就会触发相应的更新
本文代码执行流程与流程图基本相同(本文仅为了加深了解，没有增加勾销订阅等办法)

     // 发布者      function Publish() {        this.themes = []        // 增加        this.setCol = function (theme) {          this.themes.push(theme)        }        // 主题更新        this.public = function (theme) {          const { themes } = this          for (let i = 0; i < themes.length; i++) {            if (themes[i] === theme) {              console.log(`发布者触发${theme.name}主题更新`)              theme.notify()            }          }        }      }      // 主题      function Theme(name, callback) {        this.name = name        this.callback = callback        this.subscrib = []        this.setSub = function (sub) {          this.subscrib.push(sub)        }        this.notify = function () {          console.log(`${this.name}主题触发更新`)          this.subscrib.forEach((item) => {            item.updated(callback)          })        }      }      //订阅者      function Subscrib(name) {        this.name = name        this.updated = function (callback) {          console.log(`${this.name}接管到新音讯`, callback(this.name))        }      }      const sub1 = new Subscrib('订阅者1')      const sub2 = new Subscrib('订阅者2')      const theme1 = new Theme('三国', (e) => e)      const theme2 = new Theme('楚汉', (e) => e)      const publish = new Publish('发布者')      publish.setCol(theme1)      publish.setCol(theme2)      theme1.setSub(sub1)      theme2.setSub(sub1)      theme2.setSub(sub2)      publish.public(theme1)      /*         发布者触发三国主题更新        三国主题触发更新        订阅者1接管到新音讯 订阅者1       */      publish.public(theme2)      /*         发布者触发楚汉主题更新        楚汉主题触发更新        订阅者1接管到新音讯 订阅者1        订阅者2接管到新音讯 订阅者2       */