GET请求的Angular数据表的服务器端Ajax配置

const express = require('express');
const app = express();

app.get('/api/data', (req, res) => {
  // 在这里处理GET请求并返回数据
});

app.listen(3000, () => {
  console.log('服务器已启动');
});

const MongoClient = require('mongodb').MongoClient;

app.get('/api/data', (req, res) => {
  MongoClient.connect('mongodb://localhost:27017', (err, client) => {
    if (err) throw err;

    const db = client.db('mydb');
    const collection = db.collection('mycollection');

    collection.find({}).toArray((err, result) => {
      if (err) throw err;

      res.json(result); // 将查询结果以JSON格式返回给前端
      client.close();
    });
  });
});

import { HttpClient } from '@angular/common/http';

export class DataService {
  constructor(private http: HttpClient) {}

  getData() {
    return this.http.get('/api/data'); // 发送GET请求到服务器端的/api/data路由
  }
}