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                <html lang="en">
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>hash router</title>
    <li><a href="#/">/</a></li>
    <li><a href="#/page1">page1</a></li>
    <li><a href="#/page2">page2</a></li>
  <div class='content-div'></div>





                class RouterClass {
  constructor() {
    this.routes = {}        // 记录路径标识符对应的cb
    this.currentUrl = ''    // 记录hash只为方便执行cb
    window.addEventListener('load', () => this.render())
    window.addEventListener('hashchange', () => this.render())
   * 初始化
  static init() {
    window.Router = new RouterClass()
   * 注册路由和回调
   * @param path
   * @param cb 回调
  route(path, cb) {
    this.routes[path] = cb || function() {}
   * 记录当前hash,执行cb
  render() {
    this.currentUrl = location.hash.slice(1) || '/'

const ContentDom = document.querySelector('.content-div')
const changeContent = content => ContentDom.innerHTML = content

Router.route('/', () => changeContent('默认页面'))
Router.route('/page1', () => changeContent('page1页面'))
Router.route('/page2', () => changeContent('page2页面'))