1. class Route{
    2.   constructor(){
    3.     // 路由存储对象
    4.     this.routes = {}
    5.     // 当前hash
    6.     this.currentHash = ''
    7.     // 绑定this，避免监听时this指向改变
    8.     this.freshRoute = this.freshRoute.bind(this)
    9.     // 监听
    10.     window.addEventListener('load', this.freshRoute, false)
    11.     window.addEventListener('hashchange', this.freshRoute, false)
    12.   }
    13.   // 存储
    14.   storeRoute (path, cb) {
    15.     this.routes[path] = cb || function () {}
    16.   }
    17.   // 更新
    18.   freshRoute () {
    19.     this.currentHash = location.hash.slice(1) || '/'
    20.     this.routes[this.currentHash]()
    21.   }   
    22. }