npm install vue-router@next --save

npm i vue-router@3.1.3

<template>
  <!-- <h1>{{ msg }}</h1> -->
  <div class="card">
    <router-link to="/A">A</router-link>&nbsp;
    <router-link to="/B">B</router-link>&nbsp;

    <!-- 第二種方法 router.push-->
    <!-- <button @click="show('a')">A頁面</button>
    <button @click="show('b')">B頁面</button> -->
  </div>
</template>

<script setup>
import {useRouter,useRoute} from 'vue-router'
//const router = useRouter()
//const route = useRoute()

// defineProps({
//   msg: String,
// })

// 第二種跳轉(zhuǎn)方法
// const show=(index)=> {
//   if(index == 'a') {
//     router.push('/a')
//   }
//   if(index == 'b') {
//     router.push('/b')
//   }
// }
</script>

<style scoped></style>

import {createRouter, createWebHashHistory,createWebHistory} from 'vue-router'
import routes from './routes'

const router = createRouter({
	routes,
    history: createWebHashHistory()
})

export default router

const a = () => import('../view/A.vue')
const b = () => import('../view/B.vue')

const routes = [
	//實現(xiàn)路由重定向，當(dāng)進(jìn)入網(wǎng)頁時，路由自動跳轉(zhuǎn)到/a路由
	//{   
	//	path:'/',
    //    redirect:'/a'    
    // },

    {
        path: '/',
        component:a,
    },
    {
        name: 'a',
        path: '/a',
        component:a
    },
    {
        name: 'b',
        path: '/b',
        component: b
    },
    
];

export default routes

<script setup>
import HelloWorld from './components/HelloWorld.vue'
</script>

<template>
  <div>
    <h1>App 組件</h1>
    <HelloWorld msg="hello" />
    <!-- 聲明路由的占位符 -->
    <router-view></router-view>
  </div>
</template>

<style scoped>

</style>

this.$router.push('hash 地址')  跳轉(zhuǎn)到指定 Hash 地址，從而展示對應(yīng)的組件
this.$router.go(數(shù)值 n)  實現(xiàn)導(dǎo)航歷史的前進(jìn)、后退

history.go(-2);//后退兩次
history.go(2);//前進(jìn)兩次
history.back(); //后退
hsitory.forward(); //前進(jìn)