如何在JavaScript中用Mongoose动态更新文档？

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 User = mongoose.model('User', {
  name: String,
  age: Number
});

User.findOneAndUpdate({ name: 'John' }, { age: 30 }, { new: true })
  .then((updatedUser) => {
    console.log('Updated user:', updatedUser);
  })
  .catch((error) => {
    console.error('Error updating user', error);
  });

mongoose.connection.close();