如何删除“net::ERR_NAME_NOT_RESOLVED”？

Question

import Axios from 'axios';
import './App.css';  

function App() {

  const [userNameReg, setUserNameReg] = useState('')
  const [passwordReg, setPasswordReg] = useState('')

  const register = () =>{
    Axios.post("http://localhost3001/register", {
      username : userNameReg,
      password : passwordReg,
    }).then((res) =>{
      console.log(res);
    });
  };

1. POST http://localhost3001/register net::ERR_NAME_NOT_RESOLVED
2. 未捕获（承诺）错误：网络错误

• 在 createError (createError.js:16) 时
• 在 XMLHttpRequest.handleError (xhr.js:84) 处

Answer 1

看来你在 url 中缺少 ':'

axios.post("http://localhost3001/register", {

应该是

axios.post("http://localhost:3001/register", {

Answer 2

该网址的格式似乎不正确。这应该有效：

import Axios from 'axios';
import './App.css';  

function App() {

  const [userNameReg, setUserNameReg] = useState('')
  const [passwordReg, setPasswordReg] = useState('')

  const register = () =>{
    Axios.post("http://localhost:3001/register", {
      username : userNameReg,
      password : passwordReg,
    }).then((res) =>{
      console.log(res);
    });
  };
};