【Node.js】基础梳理 6 - MongoDB

19.1 选中高亮 NavLink

App.jsx

import React from "react";
import {NavLink, useRoutes} from "react-router-dom";
import routes from "./routes/index.jsx";
import "./app.css"

const App = () => {
    const element = useRoutes(routes);
    // 选中高亮
    const activeStyle = ({isActive}) => {
        return isActive ? 'background' : "";
    };
    return (
        <div className="all">
            <div>
                <div className="link">
                    <NavLink to="/home" className={activeStyle}>打开首页的页面</NavLink>
                </div>
                <div className="link">
                    <NavLink to="/about" className={activeStyle}>打开关于的页面</NavLink>
                </div>
            </div>
            <div className="view">
                {element}
            </div>
        </div>
    );
}

export default App;

19.2 嵌套路由

home(首页的页面)中嵌套两个字路由，并对字路由设置选中高亮

Home/index.jsx -> 类组件

import React from "react";
import {NavLink, Outlet} from "react-router-dom";

class App extends React.Component {

    // 类组件中不能用const定义变量
    // 选中高亮
    activeStyle = ({isActive}) => {
        return isActive ? 'background' : "";
    };

    render() {
        return (
            <div>
                首页的页面
                <div style={{display: "flex", justifyContent: 'center', marginTop: '20px'}}>
                    <NavLink to='classify' className={this.activeStyle}>classify</NavLink>
                    <NavLink to='navigation' className={this.activeStyle}>navigation</NavLink>
                </div>
                <div style={{background: 'red'}}>
                    {/*<!-- Renders the child route's element, if there is one. -->*/}
                    <Outlet/>
                </div>
            </div>);
    }
}

export default App;

路由表 routes

import {Navigate} from "react-router-dom";
import Home from "../components/Home";
import About from "../components/About";
import Classify from "../components/Home/components/Classify.jsx";
import Navigation from "../components/Home/components/Navigation.jsx";

export default [
    {
        path: '/home',
        element: <Home/>,
        children: [
            {
                path: 'classify',
                element:<Classify />
            },
            {
                path: 'navigation',
                element:<Navigation />
            },
        ]
    },
    {
        path: '/about',
        element: <About/>,
    },
    {
        path: '/',
        element: <Navigate to='about'/>,
    }
]

下面附一张文件结构图