路由（Routing）是指确定网站或应用程序中特定页面的方式。在Web开发中，路由用于根据URL的不同部分来确定应用程序中应该显示哪个内容。

1. 构建前端项目

npm init vue@latest
//或者
npm init vite@latest

2. 安装依赖和路由

npm install
npm install vue-router -S

3. router 使用

login.vue

<template>
  <div>
    <div class="login">login</div>
  </div>
</template>

<script setup lang="ts">

</script>

<style scoped>
.login {
  background-color: red;
  height: 400px;
  width: 400px;
  font-size: 20px;
  color: white;
}
</style>

reg.vue

<template>
  <div>
    <div class="reg">reg</div>
  </div>
</template>

<script setup lang="ts">

</script>

<style scoped>
.reg {
  background-color: green;
  height: 400px;
  width: 400px;
  font-size: 20px;
  color: white;
}
</style>

index.ts

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

const routes: Array<RouteRecordRaw> = [
  {
    path: "/",
    component: () => import("../components/login.vue")
  },
  {
    path: "/reg",
    component: () => import("../components/reg.vue")
  }
]

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

export default router

App.vue

<template>
  <h1>hello world</h1>
  <div>
    <router-link to="/">Login</router-link>
    <router-link style="margin: 10px;" to="/reg">Reg</router-link>
  </div>
  <hr>
  <router-view></router-view>
</template>

<script setup lang="ts">

</script>

<style scoped>

</style>

main.ts

import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
createApp(App).use(router).mount('#app')