如何在不多次初始化对象的情况下将PouchDB引用为对象的属性？

class MyObject {
  constructor() {
    this.db = new PouchDB('mydatabase');
  }

  async saveData(data) {
    try {
      await this.db.put(data);
      console.log('Data saved successfully.');
    } catch (error) {
      console.error('Error saving data:', error);
    }
  }

  async getData(id) {
    try {
      const result = await this.db.get(id);
      console.log('Data retrieved:', result);
    } catch (error) {
      console.error('Error retrieving data:', error);
    }
  }

  async deleteData(id) {
    try {
      const doc = await this.db.get(id);
      await this.db.remove(doc);
      console.log('Data deleted successfully.');
    } catch (error) {
      console.error('Error deleting data:', error);
    }
  }
}

// 创建对象并使用PouchDB实例进行数据库操作
const obj = new MyObject();
obj.saveData({ _id: '1', name: 'John' });
obj.getData('1');
obj.deleteData('1');