21.1 父组件设置路由参数
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=${this.state.name}¶m_B=${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¶m_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