如何更新mongoose中的前x个文档

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 Schema = mongoose.Schema;

const mySchema = new Schema({
  // 定义模式字段
  // ...
});

const MyModel = mongoose.model('MyModel', mySchema);

MyModel.find().limit(x).exec((error, documents) => {
  if (error) {
    console.error('Error finding documents', error);
  } else {
    documents.forEach((document) => {
      // 更新文档的逻辑
      // ...
    });
  }
});

document.save((error, updatedDocument) => {
  if (error) {
    console.error('Error saving document', error);
  } else {
    console.log('Document updated successfully', updatedDocument);
  }
});