反应路由器版本4没有任何渲染(react router version 4 not renderin

我检查[这里] [1]和[这里] [2]，但它不力帮助我。 我使用的反应路由器第4版，当我试图运行也操作台不显示任何东西，也不在我的网页。 请帮我在这里，我把一个控制台也没有任何印刷手段我headerContainer它自己也没有在这里呈现的是我的index.js

import ReactDOM from 'react-dom';
import React from 'react';

import { Provider } from 'react-redux';
import configureStore from './stores/configureStores';
import {BrowserRouter,Route,Switch} from 'react-router-dom'
import{ Dashboard} from "./containers/HeaderContainer"

const store = configureStore();

ReactDOM.render(
  <Provider store={store}>
     <BrowserRouter >
      <Switch>
        <Route exact path="/" component={Dashboard}/>
      </Switch>
    </BrowserRouter>
  </Provider>, document.getElementById('root')
);

我HeaderContainer

import React from "react"
import NavBar from "../components/Header/NavBar"

export default class HeaderContainer extends React.Component{
    render(){
        console.log("hello")
        return(
            <NavBar/>
        )
    }
}

我的导航栏

import React from "react"
import Link from "react-router"

const navBar = ({props}) => (
    <nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
        <div class="container">
            <div class="navbar-header">
                <Link to="/">
                    <img alt="snapstrat logo" src="../../../assets/images/Final_Badge.png"/>
                </Link>
            </div>
            <div class="navbar-collapse" id="bs-example-navbar-collapse-1">
                <ul class="nav navbar-nav">
                    <li>
                        <Link to="/">DASHBOARD</Link>
                    </li>
                    <li>
                        <div class="dropdown">
                            <button class="dropbtn">PRO</button>
                            <div class="dropdown-content"></div>
                        </div>
                    </li>
                    <li>
                        <div class="dropdown">
                            <button class="dropbtn">PLA</button>
                            <div class="dropdown-content"></div>
                        </div>
                    </li>
                </ul>
            </div>
        </div>
    </nav>
)
export default navBar

更新1：我修改了index.js像这样

import HeaderContainer from "./containers/HeaderContainer"

const store = configureStore();

ReactDOM.render(
  <Provider store={store}>
     <BrowserRouter >
      <Switch>
        <Route exact path="/" component={HeaderContainer}/>
      </Switch>
    </BrowserRouter>
  </Provider>, document.getElementById('root')
);


  [1]: https://stackoverflow.com/questions/44368538/react-router-v4-not-rendering-anything-when-files-separated
  [2]: https://stackoverflow.com/questions/44666170/react-router-version-4-not-showing-anything

现在m到处错误这样

warning.js:35 Warning: Unknown DOM property class. Did you mean className?
    in nav (created by NavBar)
    in NavBar (created by HeaderContainer)
    in HeaderContainer (created by Route)
    in Route
    in Switch
    in Router (created by BrowserRouter)
    in BrowserRouter
    in Provider

invariant.js:44 Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in. Check the render method of `NavBar`.
    at invariant (invariant.js:44)
    at instantiateReactComponent (instantiateReactComponent.js:74)
    at instantiateChild (ReactChildReconciler.js:44)
    at eval (ReactChildReconciler.js:71)
    at traverseAllChildrenImpl (traverseAllChildren.js:77)
    at traverseAllChildren (traverseAllChildren.js:172)
    at Object.instantiateChildren (ReactChildReconciler.js:70)
    at ReactDOMComponent._reconcilerInstantiateChildren (ReactMultiChild.js:185)
    at ReactDOMComponent.mountChildren (ReactMultiChild.js:224)
    at ReactDOMComponent._createInitialChildren (ReactDOMComponent.js:703)

编辑2：好了，现在我改变index.js像这样

import {HeaderContainer} from "./containers/HeaderContainer"

const store = configureStore();

ReactDOM.render(
  <Provider store={store}>
     <BrowserRouter >
      <Switch>
        <Route exact path="/" component={HeaderContainer}/>
      </Switch>
    </BrowserRouter>
  </Provider>, document.getElementById('root')
);

我HeaderContainer这样

import {NavBar} from "../components/Header/NavBar"

export default class HeaderContainer extends React.Component{
    render(){
        console.log("hello")
        return(
            <NavBar/>
        )

现在我回到同一位置没有错误没有渲染.. :(

Answer 1:

您需要导入Link从react-router-dom在喜欢你的导航栏组件

import {Link} from "react-router-dom"

作为Link被移动到react-router-dom包从V4起。 查看文档

另外，还要确保安装react-router-dom使用之前

npm install -S react-router-dom

并且要导入Dashboard从一个叫出口HeaderContainer组件，但它不包含任何命名出口称为仪表盘。

我认为你需要将其更改为

import Dashboard from "./containers/HeaderContainer"

文章来源: react router version 4 not rendering anything