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HTML

              
                <html lang="en">
<head>
  <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>
</head>
<body>
  <ul>
    <li><a href="#/">/</a></li>
    <li><a href="#/page1">page1</a></li>
    <li><a href="#/page2">page2</a></li>
  </ul>
  <div class='content-div'></div>
  
  <button>back</button>
</body>
</html>

              
            
!

CSS

              
                
              
            
!

JS

              
                class RouterClass {
  constructor() {
    this.isBack = false
    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
    this.historyStack = []  // hash栈
    window.addEventListener('load', () => this.render())
    window.addEventListener('hashchange', () => this.render())
  }
  
  /**
   * 初始化
   */
  static init() {
    window.Router = new RouterClass()
  }
  
  /**
   * 记录path对应cb
   * @param path
   * @param cb 回调
   */
  route(path, cb) {
    this.routes[path] = cb || function() {}
  }
  
  /**
   * 入栈当前hash,执行cb
   */
  render() {
    if (this.isBack) {      // 如果是由backoff进入,则置false之后return
      this.isBack = false   // 其他操作在backoff方法中已经做了
      return
    }
    this.currentUrl = location.hash.slice(1) || '/'
    this.historyStack.push(this.currentUrl)
    this.routes[this.currentUrl]()
    // console.log('refresh事件   Stack:', this.historyStack, '   currentUrl:', this.currentUrl)
  }
  
  /**
   * 路由后退
   */
  back() {
    this.isBack = true
    this.historyStack.pop()                   // 移除当前hash,回退到上一个
    const { length } = this.historyStack
    if (!length) return
    let prev = this.historyStack[length - 1]  // 拿到要回退到的目标hash
    location.hash = `#${ prev }`
    this.currentUrl = prev
    this.routes[prev]()                       // 执行对应cb
    // console.log('点击后退,当前stack:', this.historyStack, '   currentUrl:', this.currentUrl)
  }
}


RouterClass.init()
const BtnDom = document.querySelector('button')
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'))

BtnDom.addEventListener('click', Router.back.bind(Router), false)

              
            
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999px

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