笔记二十、使用路由Params进行传递参数

20.1、在父组件中设置路由参数

<NavLink to={`classify/${this.state.name}`} className={this.activeStyle}>classify</NavLink>

父组件 Home/index.jsx

javascript 复制代码

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' : "";
    };
    state = {name: 'lcq-lcq'};

    render() {
        return (
            <div>
                首页的页面
                <div style={{display: "flex", justifyContent: 'center', marginTop: '20px'}}>
                    <NavLink to={`classify/${this.state.name}`} 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;

20.2 在路由表中设置路由参数

path: 'classify/:param',

javascript 复制代码

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/:param',
                element:<Classify />
            },
            {
                path: 'navigation',
                element:<Navigation />
            },
        ]
    },
    {
        path: '/about',
        element: <About/>,
    },
    {
        path: '/',
        element: <Navigate to='about'/>,
    }
]

20.3 在子组件中获取路由参数

javascript 复制代码

import React from 'react';
import {useParams} from "react-router-dom";

const Classify = () => {
    const params = useParams();
    console.log(params);
    return (
        <div>
            分类的页面
            <div>
                父组件home传递的参数：{params.param}
            </div>
        </div>
    );
}

export default Classify;