什么叫路由守卫

路由在跳转之前做一些验证，比如只有登录之后才能进入用户界面。

技术要点

react-router react-redux react-thunk(react-saga)

实现功能

模仿登录，只有用户输入123，点击登录之后才能进入user.js界面

实现思路

实现的思路只要是通过高阶组件(hoc)把user封装一下，在封装的组件中，拿到isLogin是否是true,如果是true的话重定向到user组件，如果是false,则显示登录界面

创建user.js文件(基本组件)和login.js登录界面

const User = () =>{

return (

)

}

export default User

2.创建高阶组件Provide .js

import { Redirect, Route } from "react-router"

import { useSelector } from "react-redux"

function PrivateRoute (props) {

const {component:Component,...rest} =props

const data = useSelector(state=>state.user) //这个地方也可以使用connect获取值

const {isLogin} = data

return (

{...rest}

render={props =>

isLogin ? (

) : (

to={{pathname: "/login", state: {from: props.location.pathname}}}

/>

)

}

/>

)

}

export default PrivateRoute

创建路由文件

import user from './smallPage/user'

import Login from './smallPage/login'

import Provide from './PrivateRoute'

import { BrowserRouter as Router, Route, Link, Switch } from "react-router-dom";

// import a from 'react'

const Index = () => {

return (

)

}

export default Index

使用react-redux，创建index.js和reducer.js

index.js

import {applyMiddleware, createStore,combineReducers} from 'redux'

import thunk from "redux-thunk";

import {loginReducer} from './loginReducer'

import rootSaga from "../soga/rootSaga";

import createSagaMiddleware from "redux-saga";

const sagaMiddleware = createSagaMiddleware()

const store = createStore(combineReducers(

{user:loginReducer}),

// applyMiddleware(sagaMiddleware)

applyMiddleware(thunk)

)

// sagaMiddleware.run(rootSaga);

export default store

reducer.js

const userInit = {

isLogin: false,

userInfo: {id: null, name: "", score: 0},

loading: false,

err: {msg: ""}

};

// 定义用户基本信息修改规则

export const loginReducer = (state = {...userInit}, {type, payload}) => {

switch (type) {

case "REQUEST":

return {...state, loading: true};

case "LOGIN_SUCCESS":

return {...state, isLogin: true, loading: false, userInfo: {...payload}};

case "LOGIN_FAILURE":

return {...state, ...userInit, ...payload};

case "LOGOUT_SUCCESS":

return {...state, isLogin: false, loading: false};

default:

return state;

}

};

创建登录界面

import { useEffect, useState } from "react"

import { useHistory } from "react-router";

import {useSelector,useDispatch,connect} from 'react-redux'

import {login} from '../../action/index'

const Login = (props) => {

console.log("props:",props);

const {isLogin,loginResult} = props

let history = useHistory()

if (isLogin){

history.replace(props.location.state.from)

}

const [state, setState] = useState("")

const changeValue = e => {

setState(e.target.value)

}

return (

)

}

export default connect(({user}) =>({isLogin:user.isLogin}),{loginResult:login})(Login)

//react-redux 映射到组件里面，获取redux的值和方法

在service、login.js文件的写入登录函数

const LoginService = {

login(userInfo) {

return new Promise((resolve, reject) => {

setTimeout(() => {

if (userInfo.name === "123") {

resolve({id: 123, name: "omg原来是小明"});

} else {

reject({err: {msg: "用户名或密码错误"}});

}

}, 1000);

});

},

// 获取更多信息

getMoreUserInfo(userInfo) {

return new Promise((resolve, reject) => {

setTimeout(() => {

if (userInfo.id === 123) {

resolve({...userInfo, score: "100"});

} else {

reject({msg: "获取详细信息错误"});

}

}, 1000);

});

}

};

export default LoginService;

创建action/index.js文件调用登录函数,主要是给login.js文件提供方登录方法

export const LoginUserClick = user =>dispatch=>{

LoginService.login(user).then(res=>{

getMoreUserInfo(dispatch,res)

},err=>{

})

}

export const getMoreUserInfo = (dispatch, userInfo) => {

LoginService.getMoreUserInfo(userInfo).then(

res => {

dispatch({type: "LOGIN_SUCCESS", payload: res});

},

err => {

dispatch({type: "LOGIN_FAILURE", payload: err});

}

);

};

路由守卫就完成了...........