1. vue-router组件

1.1 路由的嵌套

index.js

import {createRouter, createWebHistory} from 'vue-router'const router = createRouter({history: createWebHistory(import.meta.env.BASE_URL),routes: [{path: '/login',name: 'login',component: () => import('../views/LoginView.vue')},{path: '/info',name: 'info',component: () => import('../views/InfoView.vue')},{path: '/admin',name: 'admin',component: () => import('../views/AdminView.vue'),children: [{path: "",redirect: {name: "mine"}},{path: "mine",name: "mine",component: () => import('../views/MineView.vue')},{path: "order",name: "order",component: () => import('../views/OrderView.vue')}]}]
})
export default router

App.vue

<template><div class="page-header"><div class="container"><RouterLink to="/login">登录</RouterLink> |<RouterLink to="/info">信息</RouterLink> |<RouterLink to="/admin">后台</RouterLink> |<RouterLink to="/admin/mine">我的</RouterLink></div></div><div class="container"><RouterView/></div>
</template><script setup>
</script><style scoped>
.page-header {height: 48px;background-color: cornflowerblue;line-height: 48px;
}.container {width: 980px;margin: 0 auto;
</style>

AdminView.vue

<template><h1>Admin</h1><router-link to="/admin/mine">我的</router-link> |<router-link to="/admin/order">订单</router-link><RouterView/>
</template><script setup>
</script><style scoped>
</style>

1.2 编程式导航

不使用<router-link>标签实现路由的跳转。
使用js代码实现路由跳转，例如：
InfoView.vue

<template><h1>Info</h1>
</template><script setup>
import {useRouter} from "vue-router"const router = useRouter()
// router.push({path:"/admin/order"})
// router.push({name:"login"})
router.push({name: "login", params: {nid: 100}, query: {page: 100}})
</script><style scoped></style>

浏览器的后退前进缓存中，有以下区别：
push [A,B,C,D,新页面]
replace [A,B,C,新页面]

案例1：博客+公司官网+xx在线平台

• 未登录，可以查看某些页面

• 用户登录，去登录

• 去查看某些页面

  现象：登录页是在有导航条的前提

App.vue

<template><div class="page-header"><div class="container"><RouterLink to="/info">信息</RouterLink>|<RouterLink to="/admin">后台</RouterLink>|<RouterLink to="/admin/mine">我的</RouterLink><div style="float:right;"><RouterLink to="/login">登录</RouterLink></div></div></div><div class="container"><RouterView/></div>
</template><script setup></script><style scoped>
body {margin: 0;
}.page-header {height: 48px;background-color: cornflowerblue;line-height: 48px;
}.page-header a {display: inline-block;padding: 0 10px;
}.container {width: 980px;margin: 0 auto;
}</style>

LoginView.vue

<template><div class="box"><p>用户名：<input type="text" placeholder="用户名" v-model="msg.username"></p><p>密码：<input type="text" placeholder="密码" v-model="msg.password"></p><p><button @click="doLogin">登录</button></p></div>
</template><script setup>
import {ref} from "vue";
import {useRouter} from "vue-router";const msg = ref({username: "",password: ""
})
const router = useRouter()const doLogin = function () {// 1、获取数据console.log(msg.value)// 2、发送网络请求// 3、跳转到首页router.push({name:"info"})
}</script><style scoped>
.box {width: 300px;margin: 100px auto;
}
</style>

案例2：后台管理

现象：登录页面，无导航条的前提。未登录时，不允许查看系统中有哪些菜单。
index.js

import {createRouter, createWebHistory} from 'vue-router'const router = createRouter({history: createWebHistory(import.meta.env.BASE_URL),routes: [{path: '/login',name: 'login',component: () => import('../views/LoginView.vue')},{path: '/admin',name: 'admin',component: () => import('../views/AdminView.vue'),children: [{path: "",redirect: {name: "mine"}},{path: "mine",name: "mine",component: () => import('../views/MineView.vue')},{path: "order",name: "order",component: () => import('../views/OrderView.vue')}]}]
})export default router

App.vue

<template><div class="container"><RouterView/></div>
</template><script setup>
</script><style scoped>
body {margin: 0;
}
.container {width: 980px;margin: 0 auto;
}
</style>

LoginView.vue

<template><div class="box"><p>用户名：<input type="text" placeholder="用户名" v-model="msg.username"></p><p>密码：<input type="text" placeholder="密码" v-model="msg.password"></p><p><button @click="doLogin">登录</button></p></div>
</template><script setup>
import {ref} from "vue";
import {useRouter} from "vue-router";const msg = ref({username: "",password: ""
})
const router = useRouter()const doLogin = function () {// 1、获取数据console.log(msg.value)// 2、发送网络请求// 3、跳转到首页router.push({name:"mine"})
}
</script><style scoped>
.box {width: 300px;margin: 100px auto;
}
</style>

AdminView.vue

<template><div class="page-header"><div class="container"><RouterLink to="/admin/mine">我的</RouterLink>|<RouterLink to="/admin/order">订单</RouterLink></div></div><div class="container"><RouterView/></div>
</template><script setup>
</script><style scoped>
body {margin: 0;
}
.page-header {height: 48px;background-color: cornflowerblue;line-height: 48px;
}
.page-header a {display: inline-block;padding: 0 10px;
}
.container {width: 980px;margin: 0 auto;
}
</style>

1.3 导航守卫

请求之前，路由之前，进行拦截。
守护着每一个路由。

浏览器的本地存储

• cookie：有效期+保存
• localStorage：永久保存
• sessionStorage：浏览器关闭后自动消失

index.js

import {createRouter, createWebHistory} from 'vue-router'const router = createRouter({history: createWebHistory(import.meta.env.BASE_URL),routes: [{path: '/login',name: 'login',component: () => import('../views/LoginView.vue')},{path: '/admin',name: 'admin',component: () => import('../views/AdminView.vue'),children: [{path: "",redirect: {name: "mine"}},{path: "mine",name: "mine",component: () => import('../views/MineView.vue')},{path: "order",name: "order",component: () => import('../views/OrderView.vue')}]}]
})
router.beforeEach(function (to,from,next) {// 1.访问登录页面，不需要登录就可以直接去查看if (to.name === "login") {next()return}// 2.检查用户登录状态，登录成功，继续往后走next();未登录，跳转至登录页面let username = localStorage.getItem("name")if (!username){next({name:"login"})return;}// 3.登录成功且获取到用户信息，继续向后访问next()
})
export default router

LoginView.vue

<template><div class="box"><p>用户名：<input type="text" placeholder="用户名" v-model="msg.username"></p><p>密码：<input type="text" placeholder="密码" v-model="msg.password"></p><p><button @click="doLogin">登录</button></p></div>
</template><script setup>
import {ref} from "vue";
import {useRouter} from "vue-router";const msg = ref({username: "",password: ""
})
const router = useRouter()const doLogin = function () {// 1、获取数据console.log(msg.value)// 2、发送网络请求// 3、本地存储用户信息（登录凭证）localStorage.setItem("name", msg.value.username)// 3、跳转到首页router.push({name:"mine"})
}</script><style scoped>
.box {width: 300px;margin: 100px auto;
}
</style>

AdminView.vue

<template><div class="page-header"><div class="container"><RouterLink to="/admin/mine">我的</RouterLink>|<RouterLink to="/admin/order">订单</RouterLink><div style="float:right;"><a @click="doLogout">退出</a></div></div></div><div class="container"><RouterView/></div>
</template><script setup>
import {useRouter} from "vue-router";const router = useRouter()
function doLogout() {localStorage.clear()router.push({name:"login"})
}
</script><style scoped>
body {margin: 0;
}.page-header {height: 48px;background-color: cornflowerblue;line-height: 48px;
}.page-header a {display: inline-block;padding: 0 10px;cursor: pointer;
}.container {width: 980px;margin: 0 auto;
}</style>