21.1 父组件设置路由参数

<NavLink to={`classify?param_A=${this.state.name}&param_B=${this.state.age}`}
className={this.activeStyle}>classify</NavLink>

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: 'elendaLee', age: 20};render() {return (<div>首页的页面<div style={{display: "flex", justifyContent: 'center', marginTop: '20px'}}><NavLink to={`classify?param_A=${this.state.name}&param_B=${this.state.age}`}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 子组件接收路由参数

import React from 'react';
import {useSearchParams} from "react-router-dom";const Classify = () => {// 第一个参数是接收路由参数，第二个是改变路由参数的方法，可以修改路由参数const [search, setSearch] = useSearchParams();const param_1 = search.get("param_A");const param_2 = search.get("param_B");return (<div>分类的页面<div>父组件home传递的参数1：{param_1}父组件home传递的参数2：{param_2}</div><button onClick={() => setSearch('param_A=Leo&param_B=25')}>点击更改</button></div>);
}export default Classify;

路由表不用参数设置

使用路由search进行传递参数 实用情况比较小