处理多个更新nodejs mongodb

npm install mongoose

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('Connected to MongoDB');
  })
  .catch((error) => {
    console.error('Error connecting to MongoDB', error);
  });

const userSchema = new mongoose.Schema({
  name: String,
  age: Number,
  email: String
});

const User = mongoose.model('User', userSchema);

User.updateMany({ age: { $gte: 18 } }, { email: 'example@example.com' })
  .then((result) => {
    console.log('Updated', result.nModified, 'documents');
  })
  .catch((error) => {
    console.error('Error updating documents', error);
  });