node.js - CORS 错误，我已搜索但找不到。节点.js

Question

const express = require('express');
const mongoose = require('mongoose');
const bodyParser = require('body-parser')
const cors = require('cors');
User = require('../server/models/userListModel');

const app = express();
app.use(cors());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

mongoose.connect('mongodb://localhost:27017/Userdb', {useNewUrlParser: true})

const routes = require('../server/routes/userListRoutes');
routes(app);

app.listen(process.env.PORT || 3000);
console.log('Connected to Express/MongoDB Server')

---

我有 cors，但在创建时仍然出现此错误 Failed to load htttp://localhost:3000/users：跨源请求仅支持协议方案：http、data、chrome、chrome-extension、https。

标签： node.jsexpressvuejs2