标签：ref values err location text ati 解决办法 第一个 用户
3.1. React router介绍
路由: path什么路径,component跳转到那个组件上.
import {
BrowserRouter as Router,
Switch,
Route,
Link} from "react-router-dom";
<Router>
<div className="container">
<div className="row">Hello Word!</div>
</div>
{/* component跳转到哪里去,path什么路径跳转 */}
<Route path="/" component={Home}/>
<Route path="/home" component={Home}/>
<Route path="/vip" component={Vip}/>
</Router>
3.2. React router详细介绍:
BrowserRouter as Router, as 表示别名
HashRouter和BrowserRouter得区别:
后台系统这样加没关系,前台这样加就不怎么美观
3.3. Link加个to就可以跳到指定得路由上去.
<ul>
<li><Link to="/">访问主页</Link></li>
<li><Link to="/vip">访问vip主页</Link></li>
<li><Link to="/error">访问错误主页</Link></li>
</ul>
3.4. exact精确匹配
下面得例子如果没有exact精确匹配,访问/vip会两个都访问到.
<ul>
<li><Link exact to="/">访问主页</Link></li>
<li><Link to="/vip">访问vip主页</Link></li>
</ul>
3.5. strict精确匹配
|
path |
location.pathname |
matches? |
|
/one/ |
/one |
no |
|
/one/ |
/one/ |
yes |
|
/one/ |
/one/two |
yes |
3.6 404错误页面
import React,{Component} from "react";
class ErrorPage extends Component {
render(){
return (
<div>
404页面
</div>
)
}
}
export default ErrorPage
路由上
<Route component={NoMatch}/>
3.7 Switch
当配置了错误页面后,访问其他页面,错误页面也会展示出来得解决办法.
<Switch>
<Route path="/" exact component={Home}/>
<Route path="/home" exact component={Home}/>
<Route path="/vip" exact component={Vip}/>
<Route path="/error" exact component={NoMatch}/>
<Route component={NoMatch}/>
</Switch>
3.8 render
换掉component变成render里面写东西也行.
<Route path="/vip" render={() => <div>Welcome New Home</div>}/>
<Route path="/vip" render={() => <Vip/>}/>
<Route path="/vip" render={(props) => <Vip {...props} name="六合童子"/>}/>
3.9 NavLink和Link一样,可以加一些样式
<NavLink
activeStyle={{
fontWeight: "bold",
color: "blue"
}}
to="/error">访问错误主页</NavLink>
4.0 动态路由:后面内容随便填写:
<Route path="/user/:id" component={UserPage}/>
http://localhost:3000/user/123123
组件获取:先获取props可以看下内容,再取值.
console.log(props);
console.log(props.match.params.id);
4.1 query string参数? 后面得&
网址后面有参数,第一个？第二个&
React获取方式:
console.log(props.location.search);
const params = new URLSearchParams(props.location.search);
console.log(params.get("name"));
console.log(params.get("a"));
还有一种方法是需要安装库得:
yarn add query-string
import queryString from "query-string";
let values = queryString.parse(props.location.search);
console.log(values);map类型
console.log(values.name);map类型
4.1 LInk得补充知识:
Link可以接一个字符串,也可以接一个对象
<Link to="/courses?sort=name" />
<Link to={{
pathname: "/user/1",
search: "?sort=name",
state: { fromDashboard: true }
}}
>pro</Link>
console.log(props.location.state);
需要定位到某个地方,to对象里还可以加hash=#the-hash
可以隐蔽得传递state
4.2 Redirect重定向
from访问什么地址,to跳转到另外一个地址.
<Redirect from="/user/:id" to="/vip"/>
4.3 history
props.history.push(‘/abc‘)跳转地址
4.4 withRouter高阶组件
高阶组件中的withRouter, 作用是将一个组件包裹进Route里面, 然后react-router的三个对象history, location, match就会被放进这个组件的props属性中.
import React from "react";
import PropTypes from "prop-types";
import { withRouter } from "react-router";
class ShowTheLocation extends React.Component {
static propTypes = {
match: PropTypes.object.isRequired,
location: PropTypes.object.isRequired,
history: PropTypes.object.isRequired
};
render() {
const { match, location, history } = this.props;
return <div>You are now at {location.pathname}</div>;
}
}
const ShowTheLocationWithRouter = withRouter(ShowTheLocation);
4.5 Prompt
用于提示用户,导航离开页面,刷新离开页面,就可以做出操作
<Prompt
when={!!this.state.name}
message="Are you want to leave?"
/>
4.6 可以实现点击那个link实现出现小箭头得组件
const MenuLink = ({ children,to,exact }) => {
const match = window.location.pathname === to;
return (
<Route path={to} exact={exact} children={
({match}) => (
<NavLink activeStyle={ match ? {color:"green"} : ""} to={to} >
{ match ? ‘>‘ : ‘‘}{children}
</NavLink>
)
}/>
)
};
4.7 配置化路由
定义一个route集合,遍历一下放入switch
const routes = [
{
path:"/",
component: Home,
exact: true
},
{
path:"/vip",
component: Vip,
exact: true
}
]
{
routes.map( (route) => (
<Route
key={route.path}
{...route}
/>
))
}
还可以参考网站:
https://reactrouter.com/web/api/Link
(办公)轻松学 React-Router 4(20210401)
标签：ref values err location text ati 解决办法 第一个 用户
原文地址：https://www.cnblogs.com/historylyt/p/14607542.html
