调用的函数始终返回未定义

Question

我从另一个具有文件LoggedIn（）的文件名Auth.js导入Auth类，当凭据为true时此函数返回true，否则返回false，但是当调用它时凭据正确时返回undefined，但是如果凭据正确是不正确的，它会退后

要登录但没有重定向，我希望它重定向，当Authed.LoggedIn（）返回true时可以实现

// exported file
import Axios from 'axios'
import decode from 'jwt-decode'

 export default class Auth {

    LoggedIn = () => {
       if(localStorage.getItem("token")){
         const data = decode(localStorage.getItem("token"))
         Axios.post(`http://localhost:4000/check`,{token : localStorage.getItem('token')})
         .then((res) => {
           if(data.password === res.data.password){
               console.log('In Log')
              return true
           }
           else{   
               console.log('Not Log')
              return false
           }
         })
        }
        else{
         console.log('Not 1 Log')
           return false
        }
       }

    };



// File in Use

import React from 'react'
import { BrowserRouter as Router, Route, Link, Redirect } from "react-router-dom";
import Login from './Login';
import AddEmployee from './AddEmployee'
import Header from './Header';
import SearchTable from './SearchTable';
import Main from './Main';
import ManageConfig from './ManageConfig'
import Com from './Com'
import Radio from './Radio';
import Antenna from './Antenna';
import Network from './Networks';
import Auth from './AUTH'

const Authed = new Auth()      
console.log(Authed.LoggedIn()) // return undefined if LoggedIn else 
                               //  return false  
const PrivateRoute = ({ component: Component, ...rest }) => (
    <Route 
    {...rest}
    render = {props =>
        Authed.LoggedIn() ? (
    <Component {...props} />
    ) : (
    <Redirect
    to="/"
    />
    )
    }
    />
    );



const Routes = () => {
    return (
<Router>

    <Route exact path='/' component={Login} />
    <Route path='/addEmployee' component={AddEmployee} />
    <Route path='/search' component={SearchTable} />
    <PrivateRoute  path='/config/managefreq' component={Main} />
    <PrivateRoute  path='/config/managecom' component={Com} />
    <PrivateRoute  path='/config/manageradio' component={Radio} />
    <PrivateRoute  path='/config/manageantenna' component={Antenna} />
    <PrivateRoute exact path='/config' component={ManageConfig} />  
    <PrivateRoute exact path='/manageNets' component={Network} />  
    </Router>
    )

}

export default Routes

如果已登录，则返回True