如何将数据从ajax发送到后端快递

Question

我想使用 nodejs 将数据从前端发送到后端 nodejs，我该怎么做？

这是我的 ajax 代码

const news = document.getElementById("news");
news.addEventListener('click',(e) =>{
    e.preventDefault();
    let data = " ";
    const xhttp = new XMLHttpRequest();
        const url = 'https://newsapi.org/v2/top-headlines?category=technology&apiKey=<api_key>';

        xhttp.open('GET',url, true);
        xhttp.onreadystatechange = function(){
            if(this.status === 200 && this.readyState === 4){
                let data = JSON.parse(this.response);
            }
        }

        xhttp.send();

})

后端代码是

const newsController = () => {
    return{
        getNews(req, res){
          console.log(res)
        },
        

    }
}

module.exports = newsController;

数据应该通过 get 路由发送到后端，以便我可以在 html 页面上呈现数据。

Answer 1

您可以尝试此代码，但我从此示例中删除了 userService 和 userRepo 层，它们过多。

App.js

import express from "express";
import { userRouter } from "./routes/userRoutes.js";

const PORT = process.env.PORT || 8080;
const app = express();

app.use(express.json());
app.use('/api', userRouter);

app.listen(PORT, () => console.log(`http://localhost:${PORT}`));

userRoutes.js

import userController from "../controller/userController.js";
import { Router } from "express";
const router = new Router();

router.get('/users', userController.getUsers.bind(userController));

export {router as userRouter}

userController.js

import userService from "../service/userService.js";

class UserController {

    constructor(userService) {
        this.userService = userService;
    }
           
    async getUsers(req, res) {
        res.json(await this.userService.getUsers());
    }

}

export default new UserController(userService);

或者你可以使用官方文档中的快递。