查询priceId在Firebase中的最后一次出现

- orders
  - order1
    - priceId: "123"
    - timestamp: 1625267492000
  - order2
    - priceId: "456"
    - timestamp: 1625267511000
  - order3
    - priceId: "123"
    - timestamp: 1625267530000

const firebase = require('firebase');
require('firebase/database');

firebase.initializeApp({
  // 配置你的Firebase项目凭证
});

const database = firebase.database();

const priceId = '123';

database.ref('orders')
  .orderByChild('priceId')
  .equalTo(priceId)
  .limitToLast(1)
  .once('value')
  .then((snapshot) => {
    snapshot.forEach((childSnapshot) => {
      const order = childSnapshot.val();
      console.log('最后一次出现的order:', order);
      console.log('时间戳:', order.timestamp);
    });
  })
  .catch((error) => {
    console.error('查询出错:', error);
  });