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关于vue-router:P33-vuerouter-路由守卫和懒加载

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全局守卫

每路守卫

组件内的守卫

最初，你能够在路由组件内间接定义路由导航守卫 (传递给路由配置的) 可用的配置
你能够为路由组件增加以下配置：

beforeRouteEnter
beforeRouteUpdate
beforeRouteLeave

index.js

// 1. 定义路由组件.
// 也能够从其余文件导入
import Home from "../views/Home.vue";
import About from "../views/About.vue";
import User from "../views/User.vue";
import NotFound from "../views/NotFound.vue";
import News from "../views/News.vue";
import Parent from "../views/Parent.vue";
import Styleone from "../views/Styleone.vue";
import Styletwo from "../views/Styletwo.vue";
import Page from "../views/Page.vue";
import ShopTop from "../views/ShopTop.vue";
import ShopMain from "../views/ShopMain.vue";
import ShopFooter from "../views/ShopFooter.vue";
import Sil from "../views/Sil.vue";

import {createRouter, createWebHashHistory, createWebHistory} from "vue-router";


// 2. 定义一些路由
// 每个路由都须要映射到一个组件。// 咱们前面再探讨嵌套路由。const routes = [
    {
        path: '/',
        // redirect: {name:"about"}
        //redirect: '/about'
        redirect:(to)=>{console.log(to);
            return {path:"/about"}
        }
    },
    {
        path: '/about',
        name: 'about',
        component: About,
        // 每路守卫
        beforeEnter:(to,from,next)=>{console.log(to);
            console.log(from);
            if(123 == 123){next()
            }
        }

    },
    {path: '/user/:id', component: User},
    {path: '/sil/:id', component: Sil},
    {
        name: "news",
        //path: '/news/:id(\\d+)',// 正则匹配
        // path: '/news/:id+',// 多个参数
        //path: '/news/:id+',// 参数可有可无
        //path: '/news/:id*',// 参数可反复叠加
        path: '/news/:id?',// 参数不可反复叠加
        component: News
    },
    {path: '/:path(.*)',
        component: NotFound
    },// 应用正则，匹配任意 path
    {
        path: "/parent",
        // alias: '/father', // 起一个别名
        alias: ['/father', '/laofuqin'], // 起多个别名
        component: Parent,
        children: [
            {
                path: "styleone",
                component: Styleone
            },
            {
                path: "styletwo",
                component: Styletwo
            }
        ]
    },
    {
        path: "/page",
        component: Page
    },
    {
      path: "/shop/:id",
      components: {
          default: ShopMain,
          ShopTop:ShopTop,
          ShopFooter:ShopFooter,
          ShopMain:ShopMain
      },
        props:{default: true, ShopMain: true, ShopFooter: false, ShopTop: false}
    }
]

// 3. 创立路由实例并传递 `routes` 配置
// 你能够在这里输出更多的配置，但咱们在这里
// 临时放弃简略
const router = createRouter({
    // 4. 外部提供了 history 模式的实现。为了简略起见，咱们在这里应用 hash 模式。// history: createWebHashHistory(),
    history: createWebHistory(),
    routes, // `routes: routes` 的缩写
})

// 全局守卫
// router.beforeEach((to,from,next)=>{//     console.log(to);
//     console.log(from);
//     next()// 通行证
// })


export default router

News.vue

<template>
  <div> News </div>
</template>

<script>
export default {data (){
    return {age: 18,}
  },
  name: "News",
  beforeRouteEnter(to,from,next) {console.log(to);
    console.log(from);
    next((vm)=>{console.log(vm.age)
    })
    console.log('路由进入组件前')
  },
  beforeRouteLeave()  {console.log('路由 leave 组件前')
  },
  beforeRouteUpdate()  {console.log('路由 update 组件前')
  },
}
</script>

<style scoped>

</style>

this 拿不到 data 对象的 age 值，得用 next

路由懒加载

解决一次引入大量文件
Vue Router 反对开箱即用的动静导入，这意味着你能够用动静导入代替动态导入

// 将
// import UserDetails from './views/UserDetails.vue'
// 替换成
const UserDetails = () => import('./views/UserDetails.vue')

const router = createRouter({
  // ...
  routes: [{path: '/users/:id', component: UserDetails}],
})

component (和 components) 配置接管一个返回 Promise 组件的函数，Vue Router 只会在第一次进入页面时才会获取这个函数，而后应用缓存数据。这意味着你也能够应用更简单的函数，只有它们返回一个 Promise：


const UserDetails = () =>
  Promise.resolve({/* 组件定义 */})
// 1. 定义路由组件.
// 也能够从其余文件导入
//import Home from "../views/Home.vue";
import About from "../views/About.vue";
import User from "../views/User.vue";
import NotFound from "../views/NotFound.vue";
import News from "../views/News.vue";
import Parent from "../views/Parent.vue";
import Styleone from "../views/Styleone.vue";
import Styletwo from "../views/Styletwo.vue";
import Page from "../views/Page.vue";
import ShopTop from "../views/ShopTop.vue";
import ShopMain from "../views/ShopMain.vue";
import ShopFooter from "../views/ShopFooter.vue";
import Sil from "../views/Sil.vue";

import {createRouter, createWebHashHistory, createWebHistory} from "vue-router";


// 路由懒加载，用到是再去加载


// 2. 定义一些路由
// 每个路由都须要映射到一个组件。// 咱们前面再探讨嵌套路由。const Home=()=>import('../views/Home.vue')
const routes = [
    {
        path: '/',
        // redirect: {name:"about"}
        //redirect: '/about'
        redirect:(to)=>{console.log(to);
            return {path:"/about"}
        }
    },
    {
        path: '/about',
        name: 'about',
        component: About,
        // 每路守卫
        beforeEnter:(to,from,next)=>{console.log(to);
            console.log(from);
            if(123 == 123){next()
            }
        }

    },
    {
      path: '/home',
      name: 'home',
        component: Home
      // component: ()=>import('../views/Home.vue')
    },
    {path: '/user/:id', component: User},
    {path: '/sil/:id', component: Sil},
    {
        name: "news",
        //path: '/news/:id(\\d+)',// 正则匹配
        // path: '/news/:id+',// 多个参数
        //path: '/news/:id+',// 参数可有可无
        //path: '/news/:id*',// 参数可反复叠加
        path: '/news/:id?',// 参数不可反复叠加
        component: News
    },
    {path: '/:path(.*)',
        component: NotFound
    },// 应用正则，匹配任意 path
    {
        path: "/parent",
        // alias: '/father', // 起一个别名
        alias: ['/father', '/laofuqin'], // 起多个别名
        component: Parent,
        children: [
            {
                path: "styleone",
                component: Styleone
            },
            {
                path: "styletwo",
                component: Styletwo
            }
        ]
    },
    {
        path: "/page",
        component: Page
    },
    {
      path: "/shop/:id",
      components: {
          default: ShopMain,
          ShopTop:ShopTop,
          ShopFooter:ShopFooter,
          ShopMain:ShopMain
      },
        props:{default: true, ShopMain: true, ShopFooter: false, ShopTop: false}
    }
]

// 3. 创立路由实例并传递 `routes` 配置
// 你能够在这里输出更多的配置，但咱们在这里
// 临时放弃简略
const router = createRouter({
    // 4. 外部提供了 history 模式的实现。为了简略起见，咱们在这里应用 hash 模式。// history: createWebHashHistory(),
    history: createWebHistory(),
    routes, // `routes: routes` 的缩写
})

// 全局守卫
// router.beforeEach((to,from,next)=>{//     console.log(to);
//     console.log(from);
//     next()// 通行证
// })


export default router
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