React Rout v-4`his.props.match.params` ** undefined **和`staticContext` undefined

Question

我正在使用

    "react": "^15.6.1",
    "react-dom": "^15.6.1",
    "react-router": "^4.1.2",

Hare my rout：

<BrowserRouter>
        <div>
            <Route exact path='/' component={Layout}></Route>
            <Route path='/about' name="about" component={About}>
                <Route path="/:article" component={anotherAbout}></Route>
            </Route>
            <Route path='/protfolio' name="protfolio" component={Portfolio}></Route>
        </div>
    </BrowserRouter >

当我致电{this.props.match.params.article}时，它会提供未定义

我的控制台：this.props

为什么staticContext: undefined和我的props.match.params null对象。

Answer 1

从react-router v4文档中查看此basic example。

查看const Topics = ({ match }) => ( ... )，您将看到此组件底部的嵌套路由。这是您在react-router v4中嵌套路由的方法。如果你解决了这个问题，你的问题应该得到解决。

import React from 'react'
import {
  BrowserRouter as Router,
  Route,
  Link
} from 'react-router-dom'

const BasicExample = () => (
  <Router>
    <div>
      <ul>
        <li><Link to="/">Home</Link></li>
        <li><Link to="/about">About</Link></li>
        <li><Link to="/topics">Topics</Link></li>
      </ul>

      <hr/>

      <Route exact path="/" component={Home}/>
      <Route path="/about" component={About}/>
      <Route path="/topics" component={Topics}/>
    </div>
  </Router>
)

const Home = () => (
  <div>
    <h2>Home</h2>
  </div>
)

const About = () => (
  <div>
    <h2>About</h2>
  </div>
)

const Topics = ({ match }) => (
  <div>
    <h2>Topics</h2>
    <ul>
      <li>
        <Link to={`${match.url}/rendering`}>
          Rendering with React
        </Link>
      </li>
      <li>
        <Link to={`${match.url}/components`}>
          Components
        </Link>
      </li>
      <li>
        <Link to={`${match.url}/props-v-state`}>
          Props v. State
        </Link>
      </li>
    </ul>

    <Route path={`${match.url}/:topicId`} component={Topic}/>
    <Route exact path={match.url} render={() => (
      <h3>Please select a topic.</h3>
    )}/>
  </div>
)

const Topic = ({ match }) => (
  <div>
    <h3>{match.params.topicId}</h3>
  </div>
)

export default BasicExample

Answer 2

我认为这是由于路由嵌套造成的。

而不是使用嵌套的

<BrowserRouter>
    <div>
        <Route exact path='/' component={Layout}></Route>
        <Route path='/about' name="about" component={About}></Route>
        <Route path="/about/:article" component={anotherAbout}></Route>
        <Route path='/protfolio' name="protfolio" component={Portfolio}></Route>
    </div>
</BrowserRouter >

并解构匹配的url参数

const { article } = this.props.match.params

我认为这可行