react-router-dom实现全局路由登陆拦截

　　相比与vue的路由集中式管理，能够很好的进行统一的路由操作，react的路由看起来更乱，想要进行像vue的全局路由管理不是那么得心应手。在我们的项目中，有很多页面是需要登陆权限验证的，最好的方式就是能够统一管理，而不是每个页面都要单独处理，下面是我的实现方法：

　　首先我们建一个文件routerMap.js用来存储所有的路由信息，定义需要登陆拦截的页面(auth)：

//routerMap.js

import Index from '../containers';
import Detail from '../containers/detail';
import Home from '../containers/home';
import List from '../containers/list';
import Topics from '../containers/topics';
import Parents from '../containers/passValue/parents';
import Children from '../containers/passValue/children';
import Request from '../containers/ajax';
import Like from '../containers/like';
import PopModule from '../containers/popModule/popModule';
import Reduxs from '../containers/redux/redux';
import Login from '../containers/login/login';
import Workers from '../containers/worker/worker';
import IndexedDB from '../containers/indexedDB/indexedDB';

export default [
  { path: "/", name: "App", component: Index },
  { path: "/home", name: "Home", component: Home },
  { path: "/topics", name: "Topics", component: Topics },
  { path: "/detail/:id", name: "Detail", component: Detail },
  { path: "/list", name: "List", component: List },
  { path: "/parents", name: "Parents", component: Parents },
  { path: "/children", name: "Children", component: Children },
  { path: "/ajax", name: "Request", component: Request, auth: true },
  { path: "/like", name: "Like", component: Like, auth: true },
  { path: "/popModule", name: "PopModule", component: PopModule, auth: true },
  { path: "/redux", name: "Reduxs", component: Reduxs, auth: true },
  { path: "/login", name: "Login", component: Login },
  { path: "/worker", name: "Worker", component: Workers },
  { path: "/indexedDB", name: "indexedDB", component: IndexedDB }
]

　　然后在App.js里面引入：

 //App.js
 import React from 'react';
 import {
   BrowserRouter as Router,
   Route,
   Switch,
   Redirect
 } from 'react-router-dom';
 import { connect } from 'react-redux'
 import Routers from './router/routerMap'

 // 公共头部组件
 import Header from './common/header'
 // 404页面
 import NotFound from './containers/notFound'

 class App extends React.Component {
   constructor(props) {
     super(props)
   }
   render() {
     let token = this.props.token
     return (
       <Router>
         <div>
           <Header />
           <Switch>
             {Routers.map((item, index) => {
               return <Route key={index} path={item.path} exact render={props =>
                 (!item.auth ? (<item.component {...props} />) : (token ? <item.component {...props} /> : <Redirect to={{
                   pathname: '/login',
                   state: { from: props.location }
                 }} />)
                 )} />
             })}
             // 所有错误路由跳转页面
             <Route component={NotFound} />
           </Switch>
         </div>
       </Router>
     )
   }
 }

 // redux拿到token并挂载到App的props上面
 const mapStateToProps = (state, ownProps) => {
   return { token: state.token }
 }

 export default connect(mapStateToProps)(App)

　　以上代码最重要的点是Route组建里面用render属性替换component来渲染页面，根据routerMap.js中的每一条路由信息中的auth(自定义)字段来区分是否需要进行登陆拦截，再根据redux里面的token字段来判断是不是登陆状态，然后进行相关的操作。如果已经拦截了就把当前的路由通过Redirect的state来传递到登陆页面，在登陆页面打印this.props来看控制台的输出：

　　以上红框内的信息即为重定向之前的页面信息，如果登陆成功之后回跳from.pathname即可：

// 登陆成功方法 login.jsx
setToken() {
  let token = this.state.user + this.state.pwd
  if (!token) return
  let RedirectUrl = this.props.location.state ? this.props.location.state.from.pathname : '/'
  // 修改redux中的token值
  this.props.changeActive(token)
  // 登陆成功之后的跳转
  this.props.history.push(RedirectUrl)
}

　　react全局的登陆拦截方法到此就完成了