笔记二十二、使用路由state进行传递参数

22.1 父组件设置state路由参数

<NavLink to='classify' state={{param_C: this.state.name, param_D: this.state.age}}
className={this.activeStyle}>classify</NavLink>

父组件 Home/index.jsx

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' state={{param_C: this.state.name, param_D: 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;

 22.2 子组件获取state参数

import React from 'react';
import {useLocation} from "react-router-dom";const Classify = () => {// 两次结构赋值const {state: {param_C, param_D},} = useLocation();return (<div>分类的页面<div>父组件home传递的参数1：{param_C}父组件home传递的参数2：{param_D}</div></div>);
}export default Classify;

路由表无需改动

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'/>,}
]