Login.js

import React, { useState } from 'react';
import { Formik } from 'formik';
import * as Yup from 'yup';
import styled from 'styled-components';
import { Link } from 'react-router-dom';

const Log = styled.div`
    background-color: #981e1e;
`
const Logo = styled.div`
    background-color: #E76A6A;
`


function Login() {
//     const [state, setState]= useState(false);

//   if (state) {
//     return <Redirect to="/" />;
//   }

    return (
        <div className="container-fluid">
            <div className="row">
                <Logo className="col-md-5 col-12">
                    <h2>고려대학교</h2>
                    <h4>대관 시스템</h4>
                </Logo>
                <Log className="col-md-7 col-12">
                    <Formik
          initialValues={{ email: '', password: '' }}
          validationSchema={Yup.object({
            email: Yup.string()
              .email('이메일형식이 유효하지 않습니다.')
              .required('이메일을 입력해주세요.'),
            password: Yup.string()
              .required('비밀번호를 입력해주세요.')
              .min(8, '8자 이상 입력해주세요.'),
          })}
          onSubmit={(values, { setSubmitting }) => {
            // axios({
            //   method: 'post',
            //   url: '/login',
            //   data: values,
            // }).then(res => {
            //   if (res.status === 404) return alert(res.data.error)
               alert("로그인이 완료되었습니다!")

            //   localStorage.setItem('token', res.data.token);
            //   localStorage.setItem('id', res.data.users._id);
            //   setState(true);
            // })
            //   .catch(err => {
            //     alert(err.error)
            //   });

            setTimeout(() => {
              setSubmitting(false);
            }, 400);  // finish the cycle in handler
          }}
        >
          {({
            errors,
            touched,
            handleSubmit,
            getFieldProps,  // contain values, handleChange, handleBlur
            isSubmitting,
          }) => (
              <div className="row justify-content-center align-items-center">
                <form onSubmit={handleSubmit} className="col-sm-3">
                  <div className="form-group mb-4">
                    <input
                      className={(touched.email && errors.email ? 'form-control is-invalid' : "form-control")}
                      type="email"
                      name="email"
                      {...getFieldProps('email')}
                      placeholder="Input Email"
                    />
                    {touched.email && errors.email ? (
                      <div className="invalid-feedback text-left">{errors.email}</div>
                    ) : null}
                  </div>
                  <div className="form-group mb-4">
                    <input
                      className={(touched.password && errors.password ? 'form-control is-invalid' : "form-control")}
                      type="password"
                      name="password"
                      {...getFieldProps('password')}
                      placeholder="Input Password"
                    />
                    {touched.password && errors.password ? (
                      <div className="invalid-feedback text-left">{errors.password}</div>
                    ) : null}
                  </div>
                  <button type="submit" className="btn btn-dark" disabled={isSubmitting}>
                    Login
                  </button>
        <button>
        <Link to="/Home">gha</Link></button>
                  <Link to="/signup">비밀번호를 잊으셨나요?</Link>
                  <div></div>
                  <Link to="/signup">회원이 아니신가요?</Link>
                </form>
              </div>
            )}
        </Formik>
                </Log>
            </div>
        </div>
    )
}

export default Login