1. 根据打包后的script src 中的hash值去判断，每次打包都是生成唯一的hash值，那一定是重新部署了
interface Options { timer?: number}export class Updater { oldScript: string[] //存储第一次值也就是script 的hash 信息 newScript: string[] //获取新的值 也就是新的script 的hash信息 dispatch: Record<string, Function[]> //小型发布订阅通知用户更新了 constructor(options: Options) { this.oldScript = []; this.newScript = [] this.dispatch = {} this.init() //初始化 this.timing(options?.timer)//轮询 } async init() { const html: string = await this.getHtml() this.oldScript = this.parserScript(html) } async getHtml() { const html = await fetch('/').then(res => res.text());//读取index html return html } parserScript(html: string) { const reg = new RegExp(/<script(?:\s+[^>]*)?>(.*?)<\/script\s*>/ig) //script正则 return html.match(reg) as string[] //匹配script标签 } //发布订阅通知 on(key: 'no-update' | 'update', fn: Function) { (this.dispatch[key] || (this.dispatch[key] = [])).push(fn) return this; } compare(oldArr: string[], newArr: string[]) { const base = oldArr.length const arr = Array.from(new Set(oldArr.concat(newArr))) //如果新旧length 一样无更新 if (arr.length === base) { this.dispatch['no-update'].forEach(fn => { fn() }) } else { //否则通知更新 this.dispatch['update'].forEach(fn => { fn() }) } } timing(time = 10000) { //轮询 setInterval(async () => { const newHtml = await this.getHtml() this.newScript = this.parserScript(newHtml) this.compare(this.oldScript, this.newScript) }, time) }}export default Updater
代码用法
//实例化该类
const up = new Updater({
timer:20000
})
//未更新通知
up.on('no-update',()=>{
console.log('未更新')
})
//更新通知
up.on('update',()=>{
console.log('更新了')
})
