Vue3---router（安装、路由跳转、路由守卫、本地存储）

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Vue3—router（安装、路由跳转、路由守卫、本地存储）

基础使用

安装

npm install vue-router@4

创建路由

src/router/index.js，没有则新建

import {createRouter, createWebHistory, createWebHashHistory} from "vue-router";// 引入自定义的组件
import HelloWorld from "../components/HelloWorld.vue";
import Aboutview from "../views/AboutView.vue";const routes = [{path: '/', name: 'home', component: HelloWorld},{path: '/about', name: 'about', component: Aboutview},
]const router = createRouter({routes,history:createWebHistory()
})export default router

• createWebHistory：History模式创建路由
• createWebHashHistory：Hash模式创建路由

// main.js
import { createApp } from 'vue'
import './style.css'
import App from './App.vue'
import router from "./router/index.js";createApp(App).use(router).mount('#app')

• createApp(App).use(router).mount('#app')是链式调用写法

路由跳转

无参跳转

js写法

<template><div class="card"><router-link to="/about"><button>点我跳转到About组件</button></router-link></div>
</template>

html写法

<script setup>
import {useRouter} from "vue-router";
const router = useRouter()function toAbout() {router.push('/about')
}</script><template><div class="card"><button @click="toAbout">点我跳转到About组件</button></div>
</template>

有参跳转

query

• 有参跳转的to需要在前面加上:，这样才能被vue识别为对象

<script setup>
import {useRouter} from "vue-router";
const router = useRouter()function toAbout() {router.push({name:'about',query:{id:1}})
}</script><template><div class="card">// js写法<button @click="toAbout">点我跳转到About组件</button>// html写法<router-link :to="{name:'about',query:{id:1}}"><button>我也能跳转About组件</button></router-link></div>
</template>

其他路由取出参数

• 注意这里导入的是useRoute不是useRouter

// about.vue
<script setup>
import {useRoute} from "vue-router";const router = useRoute()
const id = router.query.id
</script><template>
<h1>{{ id }}</h1>
</template>

params

// src/router/index.js
import {createRouter, createWebHistory} from "vue-router";import Aboutview from "../views/AboutView.vue";const routes = [// 在参数前面加上':'{path: '/about/:id', name: 'about', component: Aboutview},
]const router = createRouter({routes,history:createWebHistory()
})export default router

<script setup>
import {useRouter} from "vue-router";
const router = useRouter()function toAbout() {router.push({name:'about',params:{id:1}})
}</script><template><div class="card">// js写法<button @click="toAbout">点我跳转到About组件</button>// html写法<router-link :to="{name:'about',params:{id:1}}"><button>我也能跳转About组件</button></router-link></div>
</template>

两者在浏览器url中的区别：

• query：http://localhost:5173/about?id=1
• params：http://localhost:5173/about/1

路由守卫

简单示例：

// src/router/index.js
import {createRouter, createWebHistory} from "vue-router";const routes = [...]
const router = createRouter({...})// 上面是注册路由的代码
router.beforeEach((to, from) => {// 当访问路由时没有携带token会直接alert 全局生效if (!localStorage.getItem('token')){alert('没有携带token')}
})
export default router

• 此时访问任意路由都会弹出警告

• 携带token后便能正常访问

额外：本地存储

sessionStorage

// 添加
sessionStorage.setItem('name', '张三')
// 获取
sessionStorage.getItem('name')
// 删除
sessionStorage.removeItem('name')
// 清除全部
sessionStorage.clear()

localStorage

// 添加
localStorage.setItem('name', '张三')
// 获取
localStorage.getItem('name')
// 删除
localStorage.removeItem('name')
// 清除全部
localStorage.clear()

cookie

使用cookie需要安装：

npm install vue-cookies

基础用法

注册：

// main.js
import { createApp } from 'vue'
import App from './App.vue'
import VueCookies from 'vue-cookies';createApp(App).use(VueCookies).mount('#app')

增删查：

<script setup>
import {inject} from "vue";const $cookies = inject('$cookies')// 添加
$cookies.set("name", '陈五','1h')
// 查询
$cookies.get("name", '陈五','1h')
// 删除
$cookies.remove("name", '陈五','1h')

inject 用于在子组件中从父组件或根组件中注入已经创建的实例，如果不想使用也可以直接引入 VueCookies实例

<script setup>
import VueCookies from "vue-cookies";const $cookies = VueCookies
// 添加
$cookies.set("name", '陈五','1h')
</script>

示例

在main.js引入VueCookies并use

// main.js
import { createApp } from 'vue'
import './style.css'
import App from './App.vue'
import router from "./router/index.js";
import VueCookies from 'vue-cookies';createApp(App).use(VueCookies).use(router).mount('#app')

存入cookie并跳转到about组件

<script setup>
import {useRouter} from "vue-router";
import {inject} from "vue";
import VueCookies from "vue-cookies";const router = useRouter()
const $cookies = inject('$cookies');function setToken() {// 添加$cookies.set("name", '陈五','1h')router.push('about')
}
</script><template><div class="card"><button @click="setToken">点我跳转到About组件</button></div>
</template>

取出cookie并渲染到模版

<script setup>
import VueCookies from 'vue-cookies'
import {inject} from "vue";const $cookies = inject('$cookies');
const name = $cookies.get('name')</script><template>
<h1>{{ name }}</h1>
</template>
card"><button @click="setToken">点我跳转到About组件</button></div>
</template>

取出cookie并渲染到模版

<script setup>
import VueCookies from 'vue-cookies'
import {inject} from "vue";const $cookies = inject('$cookies');
const name = $cookies.get('name')</script><template>
<h1>{{ name }}</h1>
</template>

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