我正在尝试在nodejs的mongodb (mongoose)中添加新的键值对

const mongoose = require('mongoose');

const schema = new mongoose.Schema({
  key: String,
  value: String
});

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

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

const newData = {
  key: 'newKey',
  value: 'newValue'
};

MyModel.create(newData)
  .then((createdData) => {
    console.log('New data created:', createdData);
  })
  .catch((error) => {
    console.error('Failed to create new data', error);
  });

mongoose.connection.close()
  .then(() => {
    console.log('Disconnected from MongoDB');
  })
  .catch((error) => {
    console.error('Failed to disconnect from MongoDB', error);
  });