npm init @vitejs/app my-vue-app --template vue-ts

npm install vue-router@4 --save

import { createRouter, createWebHashHistory, RouteRecordRaw } from "vue-router";
const routes: Array<RouteRecordRaw> = [
 {
 path: "/",
 name: "Home",
 meta: {
  title: "首页",
  keepAlive: true
 },
 component: () => import("../views/Home/index.vue"),
 },
 {
 path: "/login",
 name: "Login",
 meta: {
  title: "登录",
  keepAlive: true
 },
 component: () => import("../views/Login/index.vue"),
 },
];
const router = createRouter({
 history: createWebHashHistory(),
 routes
});
export default router;

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

npm i vuex@next --save

import { createStore } from "vuex";
export default createStore({
 state: {
 listData:{1:10},
 num:10
 },
 mutations: {
 setData(state,value){
  state.listData=value
 },
 addNum(state){
  state.num=state.num+10
 }
 },
 actions: {
 setData(context,value){
  context.commit('setData',value)
 },
 },
 modules: {}
});

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

npm i vant@next -S

import { createApp } from 'vue'
import App from './App.vue'
import router from "./router";
import store from "./store";
import 'vant/lib/index.css'; // 全局引入样式
createApp(App)
.use(router)
.use(store)
.use(ant)
.mount('#app')

npm install postcss-pxtorem -D

module.exports = {
 "plugins": {
 "postcss-pxtorem": {
  rootValue: 37.5, 
  // Vant 官方根字体大小是 37.5
  propList: ['*'],
  selectorBlackList: ['.norem'] 
  // 过滤掉.norem-开头的class，不进行rem转换
 }
 }
}

// rem等比适配配置文件
// 基准大小
const baseSize = 37.5 
// 注意此值要与 postcss.config.js 文件中的 rootValue保持一致
// 设置 rem 函数
function setRem () {
 // 当前页面宽度相对于 375宽的缩放比例，可根据自己需要修改,一般设计稿都是宽750(图方便可以拿到设计图后改过来)。
 const scale = document.documentElement.clientWidth / 375
 // 设置页面根节点字体大小（“Math.min(scale, 2)” 指最高放大比例为2，可根据实际业务需求调整）
 document.documentElement.style.fontSize = baseSize * Math.min(scale, 2) + 'px'
}
// 初始化
setRem()
// 改变窗口大小时重新设置 rem
window.onresize = function () {
 console.log("我执行了")
 setRem()
}

import "./utils/rem"

npm i -s axios

import axios from "axios";
const service = axios.create({
 baseURL,
 timeout: 5000 // request timeout
});
// 发起请求之前的拦截器
service.interceptors.request.use(
 config => {
 // 如果有token 就携带tokon
 const token = window.localStorage.getItem("accessToken");
 if (token) {
  config.headers.common.Authorization = token;
 }
 return config;
 },
 error => Promise.reject(error)
);
// 响应拦截器
service.interceptors.response.use(
 response => {
 const res = response.data;
 
 if (response.status !== 200) {
  return Promise.reject(new Error(res.message || "Error"));
 } else {
  return res;
 }
 },
 error => {
 return Promise.reject(error);
 }
);
export default service;

import request from "../utils/request";
request({url: "/profile ",method: "get"})
.then((res)=>{
 console.log(res)
})

import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
import path from 'path';
 
// https://vitejs.dev/config/
export default defineConfig({
 plugins: [vue()],
 base:"./",//打包路径
 resolve: {
 alias:{
  '@': path.resolve(__dirname, './src')//设置别名
 }
 },
 server: {
 port:4000,//启动端口
 open: true,
 proxy: {
  // 选项写法
  '/api': 'http://123.56.85.24:5000'//代理网址
 },
 cors:true
 }
 
})

<script lang="ts">
import { defineComponent } from "vue";
import { useRouter } from "vue-router";
export default defineComponent({
 setup() {
 const router = useRouter();
 const goLogin = () => {
  router.push("/");
 };
 return { goLogin };
 },
});
</script>
<script setup>写法
<script lang="ts" setup="props">
import { useRouter } from "vue-router";
const router = useRouter();
const goLogin = () => {
 router.push("/");
};
</script>

<style vars>如何用？
<script lang="ts" setup="props">
const state = reactive({
 color: "#ccc",
});
</script>
<style >
.text {
 color: v-bind("state.color");
}
</style>