Question

我已经部署了后端和前端，但是前端无法连接到我的nodejs express后端，这给了我cors错误。在本地运行时，一切正常。这是我后端的代码。

const express = require('express');
const cors = require('cors');
const StudentVue = require('studentvue.js')
const app = express();
app.use(cors())
const url = 'https://md-mcps-psv.edupoint.com/';

app.options('*', function (req, res) {
    res.setHeader("Access-Control-Allow-Origin", "*");
    res.setHeader('Access-Control-Allow-Methods', '*');
    res.setHeader("Access-Control-Allow-Headers", "*");
    res.end();
  });
app.options('*', cors())
app.use(express.json());

app.post('/done', async (req, res)=>{

    StudentVue.login(url, req.body.name.toString(), req.body.password.toString()).then(client =>{
        client.getGradebook().then(grades => {
            let parsed = JSON.parse(grades)
            if(parsed.RT_ERROR){
                res.json({
                    message:"Invalid username or password"
                })
            }else{ 
                res.json(parsed.Gradebook.Courses.Course)
            }

        })
    })
        
    
})

错误是

VM378:1 POST https://mcpshelper-server.herokuapp.com/ 404 (Not Found)
(anonymous) @ VM378:1
(anonymous) @ client.js:15
mcpsvuehelper.surge.sh/:1 Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0

后端未连接到前端，heroku和surge

0 个答案: