路由懒加载（React和Vue）

1、为了提升性能，将懒加载的文件单独打包
在webpack.config.js配置打包成chunks

// 打包到不同的chunks
optimization: {
   
    // 将动态加载(懒加载)的文件(imort())单独打包
    splitChunks: {
   
        chunks: "all",
    },
    // 避免分割缓存失效
    runtimeChunk: {
   
        name: (entrypoint) => `runtime~${
     entrypoint.name}`,
    },
},

2、React使用路由懒加载前后对比
（1）不使用路由懒加载

import { Link, Routes, Route } from "react-router-dom"
import Home from "./pages/Home";
import About from "./pages/About";

function App() {
    return (
        <div>
            <h1>App</h1>
            <ul>
                <li>
                    <Link to="/home">Home</Link>
                </li>
                <li>
                    <Link to="/about">About</Link>
                </li>
            </ul>
            <Routes>
                <Route path="/home" element={<Home></Home>} />
                <Route path="/about" element={<About></About>} />
            </Routes>

        </div>
    )
}

不同路由文件打包到一个文件内


（2）使用路由懒加载

import React, { Suspense, lazy } from "react";
import { Link, Routes, Route } from "react-router-dom"

const Home = lazy(() => import("./pages/Home"));
const About = lazy(() => import("./pages/About"));

function App() {
    return (
        <div>
            <h1>App</h1>
            <ul>
                <li>
                    <Link to="/home">Home</Link>
                </li>
                <li>
                    <Link to="/about">About</Link>
                </li>
            </ul>
            <Suspense fallback={<div>loading...</div>}>
                <Routes>
                    <Route path="/home" element={<Home></Home>} />
                    <Route path="/about" element={<About></About>} />
                </Routes>
            </Suspense>
        </div>
    )
}

export default App;

初始跳转到Home路由只加载Home的chunk文件

点击跳转到About路由开始加载About的chunk文件

3、Vue使用路由懒加载前后对比
使用vue-loder

// router/index.js
import {
    createRouter, createWebHashHistory } from 'vue-router'

const Home = () => import('../views/Home')
const About = () => import('../views/About')

const routes = [
  {
    path: '/', redirect: '/home' },
  {
    path: '/home', name: 'home', component: Home },
  {
    path: '/about', name: 'about', component: About },
]

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

export default router

// App.vue
<template>
  <ul>
    <li>
      <router-link to="/home">Home</router-link>
    </li>
    <li>
      <router-link to="/about">About</router-link>
    </li>
  </ul>
  <router-view />
</template>

<script setup>
import {
      ref, reactive } from 'vue';

</script>

<style style="less" scoped></style>

初始跳转到Home路由只加载Home的chunk文件

点击跳转到About路由开始加载About的chunk文件