手写Vue-Router

//在router文件中的index.js中引入tvue-router.js
import Vue from 'vue'
// import VueRouter from 'vue-router'
import VueRouter from './tvue-router'
import HomeView from '../views/HomeView.vue'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    name: 'home',
    component: HomeView
  },
  {
    path: '/about',
    name: 'about',
    // route level code-splitting
    // this generates a separate chunk (about.[hash].js) for this route
    // which is lazy-loaded when the route is visited.
    component: () => import(/* webpackChunkName: "about" */ '../views/AboutView.vue')
  }
]

const router = new VueRouter({
  mode: 'history',
  base: process.env.BASE_URL,
  routes
})

export default router

let Vue;
class VueRouter {
    constructor(options){
        this.$options = options
        const initial = window.location.hash.slice(1)||'/'
        //将hash值变为响应式的值，当其改变时，用到该值得组件会刷新
        Vue.util.defineReactive(this,'current',initial)
        window.addEventListener('hashchange',()=>{
            this.current = window.location.hash.slice(1)
        })
    }

}
VueRouter.install = function(_Vue){
    Vue = _Vue
    Vue.mixin ({
        beforeCreate(){
            if(this.$options.router){
                Vue.prototype.$router = this.$options.router
            }
        }
    });
    Vue.component('router-link',{
        props:{
            to:{
                type:String,
                default:'/'
            }
        },
        render(h){
            console.log(this.$slots)
            return h('a',{
                            attrs:{
                                href:"#"+this.to
                            }
                        },
                        this.$slots.default
                    )
        }
    })
    Vue.component('router-view',{
        render(h){
            console.log(this.$router)
            let component = null;
            const route = this.$router.$options.routes.find(route=>route.path===this.$router.current)
            if(route){
                component = route.component
            }
            return h(component)
        }
    })
}


export default VueRouter