因此,我尝试使用axios从API提取数据,当我在前端代码上“ npm start”时,它返回未处理拒绝(TypeError):无法读取未定义的属性“ data”。我试图找出问题所在,但我不知道。
这是我的后端代码:
// //config
require('dotenv').config()
const express = require('express')
const app = express()
const mongoose = require('mongoose')
var cors = require('cors');
app.use(cors());
mongoose.connect(process.env.DATABASE_URL,
{
useCreateIndex: true,
useNewUrlParser: true,
useUnifiedTopology: true
}
)
app.use((req, res, next) => {
res.header('Access-Control-Allow-Origin', '*')
next();
})
const db = mongoose.connection
db.on('error', (error) => console.error(error))
db.once('open', ()=> console.log('connected'))
const gasRouter = require('./routes/gas-routes')
app.use('/api/gas', gasRouter)
const stockRouter = require('./routes/stock-routes')
app.use('/api/stock', stockRouter)
//
// const wisataPrimer = require("./routes/route.js")
// app.use('/')
app.listen(5001,() => console.log('server started'))
这是我的前端(操作)代码:
import {GET_GASTYPE, GET_STOCKTABLE} from './actionTypes';
import axios from 'axios'
export const getGasType = () => dispatch => {
axios.get('/api/gas')
.then(res =>
dispatch({
type: GET_GASTYPE,
payload: res.data
}))
.catch(err =>
dispatch((err.response.data, err.response.status))
);
};
export const getGasStatus = () => dispatch => {
axios.get('/api/stock')
.then(res =>
dispatch({
type: GET_STOCKTABLE,
payload: res.data
}))
.catch(err =>
dispatch((err.response.data, err.response.status))
);
};
你们能告诉我代码中哪一部分错误吗?谢谢。
答案 0 :(得分:0)
问题可能出在减速机上,请检查您要更新的状态是否正确