封装一下pouchdb实现增删改查

以下是一个简单的示例，演示如何封装PouchDB实现常见的增删改查操作：

class PouchDBWrapper {
  constructor(dbName) {
    this.db = new PouchDB(dbName);
  }

  async add(doc) {
    const response = await this.db.post(doc);
    return response.id;
  }

  async get(id) {
    const response = await this.db.get(id);
    return response;
  }

  async update(doc) {
    const response = await this.db.put(doc);
    return response;
  }

  async remove(id, rev) {
    const response = await this.db.remove(id, rev);
    return response;
  }

  async getAll() {
    const response = await this.db.allDocs({ include_docs: true });
    return response.rows.map(row => row.doc);
  }
}

使用示例：

const db = new PouchDBWrapper('mydb');

// 添加文档
const docId = await db.add({ name: 'John', age: 30 });

// 获取文档
const doc = await db.get(docId);

// 更新文档
doc.age = 31;
await db.update(doc);

// 删除文档
await db.remove(docId, doc._rev);

// 获取所有文档
const allDocs = await db.getAll();
``