我正在尝试在 React 中做一个验证表单，但自从我添加了保存用户注册数据以来，我遇到了很多问题。

import React, { useState } from "react";
import "./registerstyle.css";
import EyeIcon from "./EyeIcon.png";
import EyeIconHide from "./EyeIconHide.png";
import { signup } from "../../api/client";

function RegisterPage() {
  const [showPassword, setShowPassword] = useState(false);
  const [passwordVisible, setPasswordVisible] = useState(false);
  const [showConfirmPassword, setShowConfirmPassword] = useState(false);
  const [confirmPasswordVisible, setConfirmPasswordVisible] = useState(false);
  const [nameEmpty, setNameEmpty] = useState(false);
  const [confirmPasswordEmpty, setconfirmPasswordEmpty] = useState(false);
  const [emailEmpty, setEmailEmpty] = useState(false);
  const [passwordEmpty, setPasswordEmpty] = useState(false);
  const [newsletter, setNewsletter] = useState(false); // Aggiunto lo stato per la checkbox

  const [name, setName] = useState(null);
  const [email, setEmail] = useState(null);
  const [password, setPassword] = useState(null);
  const [cpass, setCpass] = useState(null);
  const user = { name: name, email: email, password: password, cpass: cpass };



  const handleShowPassword = () => {
    setShowPassword(!showPassword);
    setPasswordVisible(!passwordVisible);
  };

  const handleShowConfirmPassword = () => {
    setShowConfirmPassword(!showConfirmPassword);
    setConfirmPasswordVisible(!confirmPasswordVisible);
  };

  const handleFormSubmit = (e) => {
    e.preventDefault();

    // Verifica se i campi email e password sono vuoti
    if (!e.target.email.value) {
      setEmailEmpty(true);
      console.log("email True");
    } else {
      setEmailEmpty(false);
      console.log("email False");
    }

    if (!e.target.name.value) {
      setNameEmpty(true);
    } else {
      setNameEmpty(false);
    }

    if (!e.target.password.value) {
      setPasswordEmpty(true);
    } else {
      setPasswordEmpty(false);
    }

    if (!e.target.confirmPassword.value) {
      setconfirmPasswordEmpty(true);
    } else {
      setconfirmPasswordEmpty(false);
    }
  };

  const handleNewsletterChange = (e) => {
    setNewsletter(e.target.checked);
  }; // Funzione per gestire il cambiamento di stato della checkbox

  const passwordInputClass = passwordVisible ? "passwordVisible" : "";
  const confirmPasswordInputClass = confirmPasswordVisible ? "confirmPasswordVisible" : "";

  return (
    

      

      

      

      

      

        
          {/* NAME */}
           { setName(e.target.value) }} required/>
        
        {nameEmpty && (
          

            

            

            

            

          
        )}
        

        
          {/* EMAIL */}
           { setEmail(e.target.value) }} required/>
        
        {emailEmpty && (
          

            

            

            

            

          
        )}
        

        
          {/* PASSWORD*/}
           { setPassword(e.target.value) }}
          />
           {
              handleShowPassword();
            }}
          />
        
        {passwordEmpty && (
          

            

            

            

            

          
        )}
        

        
          {/* CONFIRM PASSWORD */}
           { setCpass(e.target.value) }}
          />
           {
              handleShowConfirmPassword();
            }}
          />
        
        {confirmPasswordEmpty && (
          

            

            

            

            

          
        )}
        

         {/* NEWSLETTER */}
          
        
        Send me newsletters, tricks and updates. 
        

         {
          e.preventDefault();
          signup(user);
          handleFormSubmit(e);
        }}/>
      
      

        Already have an account? Login now
      
    

  );
}

export default RegisterPage;

这是注册代码：

import axios from "axios";

// const client = axios.create({
//   baseURL: "http://localhost:9000", // o l'endpoint del vostro backend
//   headers: {
//     "Content-Type": "application/json",
//     //     "Authorization": "Bearer " + localStorage.getItem("token")
//   }
// });

// export default client;


async function signup(user) {
  const newUser = JSON.stringify(user);
  console.log("sono dentro la funzione");

  try {
    return await axios.post("http://localhost:3000/signup", newUser);
  } catch (err) {
    if (err.response) {
      return err.response.data;
    } else {
      console.log("Errore:", err.message);
    }
  }
};

async function login(user) {
  const newUser = JSON.stringify(user);
  console.log("sono dentro");

  try {
    return await axios.post("http://localhost:3000/login", newUser);
    //return await axios.post("http://localhost:3000/login",)
  } catch (err) {
    if (err.response) {
      return err.response.data;
    } else {
      console.log("Errore:", err.message);
    }
  }
};

async function loginOld(credentials) {
  const loginData = JSON.stringify(credentials);
  await axios.post("http://localhost:3000/login", loginData);
};

export { signup, login };

我预计会发生什么，当您单击按钮时字段留空时，它们会从我创建的图像中弹出以圈出留空的字段。有时它会给出如下错误：

TypeError: Cannot read properties of undefined (reading 'value')
    at handleFormSubmit (http://localhost:3000/main.7b4752724621de0f0bc6.hot-update.js:66:25)
    at onClick (http://localhost:3000/main.7b4752724621de0f0bc6.hot-update.js:387:11)
    at HTMLUnknownElement.callCallback (http://localhost:3000/static/js/bundle.js:14655:18)
    at Object.invokeGuardedCallbackDev (http://localhost:3000/static/js/bundle.js:14699:20)
    at invokeGuardedCallback (http://localhost:3000/static/js/bundle.js:14756:35)
    at invokeGuardedCallbackAndCatchFirstError (http://localhost:3000/static/js/bundle.js:14770:29)
    at executeDispatch (http://localhost:3000/static/js/bundle.js:18914:7)
    at processDispatchQueueItemsInOrder (http://localhost:3000/static/js/bundle.js:18940:11)
    at processDispatchQueue (http://localhost:3000/static/js/bundle.js:18951:9)
    at dispatchEventsForPlugins (http://localhost:3000/static/js/bundle.js:18960:7)```

I'm desperate and don't really know where to put my hands.