企业网站的建设多少钱省建设厅官方网站
一、创建项目
运行项目
二、目录结构
项目目录：
├─node_modules //第三方依赖
├─public //静态资源（不参与打包）
└─src├─assets //静态资源├─components //组件├─config //配置├─http //请求方法封装├─layout //页面布局├─pages //页面├─routes //路由├─service //请求├─store //状态管理└─util //通用方法└─App.css└─App.tsx└─index.css└─main.tsx└─vite-env.d.ts
├─.eslinttrc.cjs
├─.gitignore
├─index.html //项目页面总入口
├─package.json
├─tsconfig.json //ts配置文件
├─tsconfig.node.json
├─vite.config.ts //vite配置文件
三、sass安装
1 安装
npm i sass -D2 创建全局 scss 文件
3 引入
这里的additionalData改为
additionalData: `@import "./src/assets/styles/index.scss";`4 修改这4个文件
index.css去掉
main.tsx 中 import './index.css' 去掉
app.css 变成 app.scss，内容只剩下，h1{ color:$red; }
app.tsx 代码如下
import './App.scss'function App() {return (<><h1>Vite + React</h1></>)
}export default App
sass成功，页面如下
四、写一个函数式组件和类组件
import './App.scss'// 函数式组件写法
// import React, { useState } from 'react';
// function Example() {
// const [count, setCount] = useState(0);
// return (
// <div>
// <p>You clicked {count} times</p>
// <button onClick={() => setCount(count + 1)}>
// Click me
// </button>
// </div>
// );
// }// 类组件写法
import React from 'react';
class Example extends React.Component<any, any> {constructor(props: any) {super(props);this.state = {count: 0}}render() {return (<div><p>You clicked {this.state.count} times</p><button onClick={() => this.setState({ count: this.state.count + 1 })}>Click me</button></div>);}
}function App() {return (<><h1>Vite + React</h1><Example></Example></>)
}export default App
五、路由
1 下载
npm install react-router-dom -S
新建3个页面
HashRouter路由（vue中的hash模式）
main.tsx
import React from 'react'
import ReactDOM from 'react-dom/client'
import App from './App'
import { HashRouter as Router } from 'react-router-dom';ReactDOM.createRoot(document.getElementById('root') as HTMLElement).render(<React.StrictMode><Router><App /></Router></React.StrictMode>
)
app.tsx
import { Route, Routes, Link, useNavigate } from "react-router-dom";
import Login from "./pages/login";
import Home from "./pages/home";
import User from "./pages/user";
import './App.scss'function App() {const navigate = useNavigate();return (<div className="App">{/* 指定跳转的组件，to 用来配置路由地址 */}<Link to="/">首页</Link><br /><Link to="/user">用户</Link><br /><button onClick={() => navigate('/login')}> 登录 </button><hr />{/* 路由出口：路由对应的组件会在这里进行渲染 */}<Routes>{/* 指定路由路径和组件的对应关系：path 代表路径，element 代表对应的组件，它们成对出现 */}<Route path='/' element={<Home />}></Route><Route path='/user' element={<User />}></Route><Route path='/login' element={<Login />}></Route></Routes></div>)
}export default App
成功结果如下
BrowserRouter路由（vue中的history模式?）
main.tsx
import React from 'react'
import ReactDOM from 'react-dom/client'
import App from './App.tsx'
import { BrowserRouter as Router } from 'react-router-dom';ReactDOM.createRoot(document.getElementById('root') as HTMLElement).render(<React.StrictMode><Router><App /></Router></React.StrictMode>,
)app.tsx
import { Route, Routes, Link, useNavigate } from "react-router-dom";
import Login from "./pages/login";
import Home from "./pages/home";
import User from "./pages/user";
import './App.scss'function App() {const navigate = useNavigate();return (<div className="App">{/* 指定跳转的组件，to 用来配置路由地址 */}<Link to="/">首页</Link><br /><Link to="/user">用户</Link><br /><button onClick={() => navigate('/login')}> 登录 </button><hr />{/* 路由出口：路由对应的组件会在这里进行渲染 */}<Routes>{/* 指定路由路径和组件的对应关系：path 代表路径，element 代表对应的组件，它们成对出现 */}<Route path='/' element={<Home />}></Route><Route path='/user' element={<User />}></Route><Route path='/login' element={<Login />}></Route></Routes></div>)
}export default App嵌套路由
app.tsx
// 嵌套路由
import { Route, Routes, Link, useNavigate } from 'react-router-dom';
import Login from "./pages/login";
import Home from "./pages/home";
import User from "./pages/user";
import './App.scss'
function App() {const navigate = useNavigate();return (<div className="App">{/* 指定跳转的组件，to 用来配置路由地址 */}<Link to="/home">首页</Link><br /><Link to="/home/user">用户</Link><br /><button onClick={() => navigate('/home/login')}> 登录 </button>{/* 路由出口：路由对应的组件会在这里进行渲染 */}<Routes>{/* 指定路由路径和组件的对应关系：path 代表路径，element 代表对应的组件，它们成对出现 */}<Route path='/home' element={<Home />}><Route path='user' element={<User />}></Route><Route path='login' element={<Login />}></Route></Route></Routes></div>)
}
export default Apphome.tsx
import { Outlet } from "react-router-dom";
function Home() {return (<div><div>home页面</div><Outlet /></div>);
}export default Home;
页面如下
重定向
import { Navigate } from 'react-router-dom';
<Route path='/' element={<Navigate to="/layout" />}></Route>
useRoutes路由配置
1 app.scss
h1{color:$red;
}body{padding: 0;margin: 0;width: 100vw;height: 100vh;
}
#root{padding: 0;margin: 0;width: 100vw;height: 100vh;
}app.tsx
import GetRoutes from "./routes/index";
import './App.scss'function App() {return (<GetRoutes></GetRoutes>)
}
export default Apphome.tsx
function Home() {return (<div>home页面</div>);
}
export default Home;新增文件
routes/index.tsx 代码如下
import { useRoutes, Navigate, RouteObject } from "react-router-dom";import Layout from "../layout/index";
import Login from "../pages/login";
import Home from "../pages/home";
import User from "../pages/user";export const router_item: Array<object> = [{ path: "/", label: "首页", element: <Navigate to="/layout/home" /> },{path: "/layout",label: "控制台",element: <Layout />,children: [{path: "home",label: "首页",element: <Home />},{path: "login",label: "登录页",element: <Login />,},{path: "user",label: "用户页",element: <User />},],},
];function GetRoutes() {const routes: RouteObject[] = useRoutes(router_item);return routes;
}export default GetRoutes;
layout/index.tsx 代码如下
import { Outlet, Link } from "react-router-dom";
function Layout() {return (<><div style={{display: 'flex', width: '100%', height: '100%'}}><div style={{width: '200px', background: '#eee'}}><Link to="/layout/home">home 页</Link><br /><Link to="/layout/login">login 页</Link><br /><Link to="/layout/user">user 页</Link><br /></div><div style={{flex: '1'}}><Outlet /></div></div></>);
}
export default Layout;页面成功如下
路由懒加载
有些页面比较大，我们可以使用懒加载，来提升页面加载性能，避免页面卡顿；react官网提供了路由懒加载的完整实例：react路由懒加载。懒加载主要借助lazy、suspense组件来实现。
lazy 能够让你在组件第一次被渲染之前延迟加载组件的代码。<Suspense> 允许您显示临时组件（一般是一个loading状态），直到其子项完成加载。
修改 routes/index.tsx 代码如下
import { useRoutes, Navigate, RouteObject } from "react-router-dom";import Layout from "../layout/index";
import Login from "../pages/login";
import Home from "../pages/home";
import User from "../pages/user";import { lazy } from "react";
import lazyLoad from "./lazyLoad";
// 添加一个固定的延迟时间，以便你可以看到加载状态
function delayForDemo(promise: Promise<any>) {return new Promise(resolve => {setTimeout(resolve, 2000);}).then(() => promise);
}export const router_item: Array<object> = [{ path: "/", label: "首页", element: <Navigate to="/layout/home" /> },{path: "/layout",label: "控制台",element: <Layout />,children: [{path: "home",label: "首页",// element: <Home />element: lazyLoad(lazy(() => delayForDemo(import("../pages/home")))) //故意延迟2s,这里是延迟加载},{path: "login",label: "登录页",// element: <Login />,element: lazyLoad(lazy(() => import("../pages/login"))), //这里是延迟加载},{path: "user",label: "用户页",element: <User />},],},
];function GetRoutes() {const routes: RouteObject[] = useRoutes(router_item);return routes;
}export default GetRoutes;
增加文件
lazyLoad.tsx 代码如下
import { LazyExoticComponent, Suspense } from "react";
import Spinner from "../components/spinner";
/*** 实现路由懒加载* @param Comp 懒加载组件* @returns */
function lazyLoad(Comp: LazyExoticComponent<() => JSX.Element>) {return (<Suspense fallback={<Spinner />}><Comp /></Suspense>);
}export default lazyLoad;
spinner.tsx 代码如下
function Spinner() {return (<>loading...</>);
}export default Spinner;