阅读教程后,我设法在代码中找出< Redirect />的用法：

import React from 'react';
import Login from './Login';
import Dashboard from './Dashboard';
import {Route,NavLink,BrowserRouter,Redirect} from 'react-router-dom';

const supportsHistory = 'pushState' in window.history;

export default class App extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            username: '',password: '',redirectToDashboard: false,}
    }

//-----------------------LOGIN METHODS-----------------------------
    onChangeInput(e) {
        this.setState({[e.target.name]:e.target.value});
    }
    login(e) {
        e.preventDefault();
        const mainThis = this;
        if (mainThis.state.username && mainThis.state.password) {
            fetch('APILink')
            .then(function(response) {
                response.text().then(function(data) {
                    data = JSON.parse(data);
                    if (!data.error) {
                        mainThis.setState({redirectToDashboard:true});
                    } else {
                        alert(data.msg);
                    }
                })  
            })
        } else {
            alert('Username and Password needed');
        }
    }

    renderRedirect = () => {
        if (this.state.redirectToDashboard) {
            return <Redirect exact to='/company' />
        } else {
            return <Redirect exact to='/login' />

        }
     }

    render() {
        let renderedComp;
        return(
            <BrowserRouter 
                    basename='/'
                    forceRefresh={!supportsHistory}>
                <React.Fragment>
                    {this.renderRedirect()}
                    <Route exact path="/company" render={()=><Dashboard/>} />
                    <Route exact path="/login" render={()=><Login login={(e)=>this.login(e)} onChangeInput={(e)=>this.onChangeInput(e)} />} />
                </React.Fragment>
            </BrowserRouter>
        )
    }
}

这将基于this.state.redirectToDashboard的值检查要显示的组件,但是由于：

onChangeInput(e) {
    this.setState({
        [e.target.name]:e.target.value
    });
}

每次输入都会重新渲染页面,让我留下：

Warning: You tried to redirect to the same route you’re currently on: “/login”

我知道是什么原因引起了警告,只是我想不出其他方法来完成此工作.我应该进行哪些更改,或者至少要想出一个适当的方法才能完成这项工作？