Node.js 为什么 Cors 在 NodeJS 中不起作用

我在NodeJS和Vue.js的前端都遇到了CORS问题. 问题是

Access to XMLHttpRequest at 'http://localhost:3007/auth/login' from origin 'http://localhost:5173' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.个

帮我解决这个问题

让我分享我的代码，我已经try 过了.

import express from "express";
import mongoose from "mongoose";
import { config } from "dotenv";
import { router as loginRoute } from "./routes/login.js";
import cors from "cors";
import "dotenv/config.js";

const app = express();
app.use(express.json());

// Server connect
app.listen(3007, () => {
    console.log(`I m listening on 3007`);
});

// route
app.use("/auth", loginRoute);

// CORS Cross Orgin Resource Sharing

app.use(
 cors({
     origin: "http://localhost:5173",
     optionsSuccessStatus: 200,
     methods: ["GET", "POST", "DELETE", "UPDATE", "PUT", "PATCH"],
     preflightContinue:false
 })
);

我试了app.use(cors());次这个代码，但还是不起作用