问题描述：

老师给的登录端口（http://www.dell-lee.com/react/api/isLogin.json）我登录成功后没有返回值回来，还是未登录时返回回来的值 false，刷新页面也重置登录状态了

相关代码：

import { Component } from 'react';
import { Modal, Button, Input, message } from 'antd';
import { EyeInvisibleOutlined, EyeTwoTone } from '@ant-design/icons';
import { Link, withRouter } from 'react-router-dom';
import axios from 'axios';

class Login extends Component {
  constructor(props) {
    super(props);
    this.state = {
      login: false,
      isLoginModalVisible: false,
      userName: '',
      userPassWord: '',
    };

    this.handleLogin = this.handleLogin.bind(this);
    this.handleLogout = this.handleLogout.bind(this);
    this.handleOk = this.handleOk.bind(this);
    this.handleCancel = this.handleCancel.bind(this);
    this.userName = this.userName.bind(this);
    this.userPassWord = this.userPassWord.bind(this);
  }

  handleLogin() {
    this.setState({
      isLoginModalVisible: true,
    });
  }

  handleCancel() {
    this.setState({
      isLoginModalVisible: false,
    });
  }

  // 老师，如果这里还想加上按下回车键也能登录是在哪里添加代码？
  handleOk() {
    const { userName, userPassWord } = this.state;
    const url = `http://www.dell-lee.com/react/api/login.json?user=${userName}&password=${userPassWord}`;
    axios
      .get(url, {
        withCredentials: true,
      })
      .then((res) => {
        const login = res.data.data.login;
        if (login) {
          message.success('登陆成功');
          this.setState({
            login: true,
            isLoginModalVisible: false,
          });
        } else {
          message.error('登陆失败');
        }
      });
  }

  handleLogout() {
    axios
      .get('http://www.dell-lee.com/react/api/logout.json', {
        withCredentials: true,
      })
      .then((res) => {
        const data = res.data.data;
        if (data.logout) {
          this.setState({
            login: false,
          });
        }
        this.props.history.push('/');
      });
  }

  userName(e) {
    this.setState({
      userName: e.target.value,
    });
  }

  userPassWord(e) {
    this.setState({
      userPassWord: e.target.value,
    });
  }

  render() {
    const login = this.state.login;
    return (
      <div className="login" style={{ marginLeft: 1400 }}>
        {login ? (
          <Button type="primary" onClick={this.handleLogout}>
            退出
          </Button>
        ) : (
          <Button type="primary" onClick={this.handleLogin}>
            登录
          </Button>
        )}
        <Link to="/vip">
          <Button type="primary" onClick={this.handleVip} style={{ marginLeft: 10 }}>
            VIP
          </Button>
        </Link>
        <Modal
          title="用户登录"
          okText="登录"
          cancelText="取消"
          visible={this.state.isLoginModalVisible}
          onOk={this.handleOk}
          onCancel={this.handleCancel}
        >
          <Input placeholder="请输入你的用户名" value={this.state.userName} style={{ marginBottom: 10 }} onChange={this.userName} />
          <Input.Password
            placeholder="请输入你的密码"
            value={this.state.userPassWord}
            onChange={this.userPassWord}
            iconRender={(visible) => (visible ? <EyeTwoTone /> : <EyeInvisibleOutlined />)}
          />
        </Modal>
      </div>
    );
  }

  componentDidMount() {
    axios
      .get('http://www.dell-lee.com/react/api/isLogin.json', {
        withCredentials: true,
      })
      .then((res) => {
        const login = res.data.data.login;
        console.log(login);
        this.setState({ login });
      });
  }
}

export default withRouter(Login);

​