一、Vue路由基础用法:

1 .安装
 npm install vue-router --save
2 .main.js中
//Vue路由:引入
import VueRouter from 'vue-router'
Vue.use(VueRouter)

//Vue路由:引入并创建组件
import BYHome from './components/BYHome.vue'
import BYNews from './components/BYNews.vue'
import HelloWorld from './components/HelloWorld.vue'

//Vue路由:配置路由
const routes = [
  {path: '/home', component: BYHome},
  {path: '/news', component: BYNews},
  {path: '/helloworld', component: HelloWorld},
  {path: '*', redirect: '/home'} /*默认跳转路由 */
]

//Vue路由:实例化VueRouter 
const router = new VueRouter({
  routes //缩写,相当于 routes:routes
})

new Vue({
  router, //Vue路由:挂载路由
  render: h => h(App),
}).$mount('#app')

//Vue路由:根组件的模板里面放上下面这句话,需要在App.vue 中配置路由出口:路由匹配到的组件将渲染在根组件App.vue中
<router-view></router-view>

//路由跳转
<router-link to="/home">首页</router-link>  
<router-link to="/news">新闻</router-link>
<router-link to="/helloworld">helloWorld</router-link>

二、Vue路由配置的抽出

1.安装

  npm install vue-router --save

2.创建router.js文件,在该文件中配置路由并暴露出去

 import Vue from 'vue';
  //Vue路由:引入
    import VueRouter from 'vue-router'
    Vue.use(VueRouter)

    //Vue路由:引入并创建组件
    import BYHome from '../BYHome.vue'
    import BYNews from '../BYNews.vue'
    import HelloWorld from '../HelloWorld.vue'

    //Vue路由:配置路由
    const routes = [
      {path: '/home', component: BYHome},
      {path: '/news', component: BYNews},
      {path: '/helloworld', component: HelloWorld},
      {path: '*', redirect: '/home'} /*默认跳转路由 */
    ]

    //Vue路由:实例化VueRouter 
    const router = new VueRouter({
      routes //缩写,相当于 routes:routes
    })
    //Vue路由:需要在App.vue 中配置路由出口:路由匹配到的组件将渲染在根组件App.vue中
    /* <router-view></router-view> */


    //暴露出去
    export default router;

3.在main.js中

//Vue路由:引入路由文件
import router from ‘./components/jsTool/router.js’

new Vue({
router, //Vue路由:挂载路由
render: h => h(App),
}).$mount(’#app’)

4.Vue路由:根组件的模板里面放上下面这句话,需要在App.vue 中配置路由出口:路由匹配到的组件将渲染在根组件App.vue中

   <router-view></router-view>

5.路由跳转

<router-link to="/home">首页</router-link>  
<router-link to="/news">新闻</router-link>
  <router-link to="/helloworld">helloWorld</router-link>

三、路由动态传值:

1.获取路由的get传值

//路由配置

import BYHomeDetail from '../BYHomeDetail.vue'
{path: '/homeDetail', component:BYHomeDetail},
//跳转时跟get参数
<li li v-for="(listItem,homeKey) in msglist">
            <router-link :to="'/homeDetail?id='+homeKey"> {{listItem.title}} </router-link>
 </li>
 //子页面获取路由的get传值
  mounted(){
    console.log(this.$route.query);
}

2.动态路由传值

//路由配置:带形参
import BYNewDetail from '../BYNewDetail.vue'
{path: '/newDetail/:aid', component: BYNewDetail}, 
//跳转时传值
<li v-for="(item,key) in list">
    <!-- 给 newDetail 传值 -->
    <router-link :to="'/newDetail/'+key">{{key}}--{{item}}</router-link>
</li>
//子页面获取动态路由传值
 mounted(){
    console.log(this.$route.params);
}

四、路由的跳转方式:

第一种跳转方式:编程式导航

{path: '/news', component: BYNews},
this.$router.push({path:'news'});
带参:
{path: '/newDetail/:aid', component: BYNewDetail},
this.$router.push({path:'/newDetail/495'});

第二种跳转方式:命名路由

 {path: '/news', component: BYNews,name:'news'},
    this.$router.push({name:'news'});
    带参:
    this.$router.push({name:'news',params:{userId:123}});

五、路由的hash模式以及history模式:

默认是hash模式,路由上方的路径是用#表示,http://localhost:8080/#/news

可以将hash模式改为history模式,路由上方的路径就没有了

#,http://localhost:8080/news 
  如果有history模式,需要后台做一些配置
  //Vue路由:实例化VueRouter 
const router = new VueRouter({
  mode: 'history',   //若是默认的hash模式,则mode不需要写
  routes //缩写,相当于 routes:routes
})

六、路由的嵌套

User.vue页面中有两个子页面
UserAdd.vue
UserList.vue

//路由的配置
import BYUser from '../BYUser.vue'
  import UserAdd from '../User/UserAdd.vue'
  import UserList from '../User/UserList.vue'

{path: '/user' , component:BYUser,
    children:[
      {path: 'useradd',component:UserAdd},
      {path: 'userlist',component:UserList}
    ]
},

//路由的跳转
<div>
    <div class="left">
        <ul>
            <li>
                <router-link to="/user/useradd"> 增加用户 </router-link>
            </li>
            <li>
                 <router-link to="/user/userlist"> 用户列表 </router-link>
            </li>
        </ul>
    </div>
    <div class="right">
        <router-view></router-view>
    </div>
</div>

七、登录及首页的路由配置说明
1.创建一个localstorage本地存储类storage.js,用来记录登录状态

var storage={
    set(key,value){
        console.log("storage---->")
        console.log(value)
        localStorage.setItem(key, JSON.stringify(value));
    },
    get(key){
        return JSON.parse(localStorage.getItem(key));
    },remove(key){
        localStorage.removeItem(key);
    }
}
export default storage;

2.创建一个自定义的路由表:router.js

import Vue from 'vue';
//引入路由
import VueRouter from 'vue-router'
Vue.use(VueRouter)

//设置路由表
const routes = [
 {
   path: '/',
   redirect: '/home'
 },
 {path: '/404', component: resolve => require(['../common/404.vue'],resolve)},
 {path: '/login', component: resolve => require(['../page/Login.vue'],resolve)},
 {path: '/home',component: resolve => require(['../page/Home.vue'],resolve),meta:{requireAuth:true}},//加上meta 表示需要登录才可进入
 {
   path:'*',
   redirect:'/404'
 }
]
//实例化路由并指定模式
const router = new VueRouter({
 /*默认是hash模式,路由上方的路径是用#表示,http://localhost:8080/#/news
 可以将hash模式改为history模式,路由上方的路径就没有了#,http://localhost:8080/news 
   如果有history模式,需要后台做一些配置
 */
   // mode:'history',
   routes //缩写,相当于 routes:routes
})
//暴露出去,供外部调用
export default router;

3.在main.js中配置钩子路由:

//引入自定义的路由表
import router from './components/router/router.js'
//引入localstorage本地存储管理
import storage from "./components/Tools/storage.js";
/**在路由跳转之前执行
 * to: 即将进入的路由对象
 * from: 当前导航即将离开的路由
 * next:Function,进行管道中的一个钩子,如果执行完了,则导航的状态就是 confirmed (确认的);否则为false,终止导航。
 *  */
router.beforeEach((to, from, next) => { 
  //需要登录,但未登录者可以跳转到登录页面
  const isLogin = storage.get('login');
  if(!isLogin && to.meta.requireAuth){//未登录 且 需要登录(提前在路由表中加上meta)
    next({
      path:'/login'
    })
  }else{//其他
    next();
  }
});

4.登录及退出登录

    
登录:
    console.log("登录成功");
    let flag = true;
    storage.set('login',flag);//存储登录状态
    this.$router.push('/');//按路由规则跳转
退出登录:
    console.log("退出登录");
    let flag = false;
    storage.set('login',flag);//存储登录状态
    this.$router.push('/login');//按路由规则跳转
            
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