代码封装：

/**
 * 封装的方法以及用法
 */

/**
 * 创建数据库
 * @param dbName 库名
 * @param storeName 表名（对象存储区）
 * @param version 版本号（根据下面的代码，添加新表时需修改）
 * @returns 创建出的数据库对象
 */
export function openDB(dbName: any, storeName: any, version = 1) {
  return new Promise((resolve, reject) => {
    let indexedDB = window.indexedDB;
    if (!indexedDB) {
      console.log("你的浏览器不支持IndexedDB");
    }
    let db;
    // 创建或者打开一个数据库
    const request = indexedDB.open(dbName, version);
    
    // 打开数据库成功
    request.onsuccess = function (event: any) {
      db = event.target.result; // 数据库对象
      resolve(db);
    };

    // 打开数据库报错
    request.onerror = function (event) {
      reject(event);
    };

    // 数据库创建或升级的时候会触发
    request.onupgradeneeded = function (event: any) {
      db = event.target.result; // 数据库对象
      let objectStore;
      if (!db.objectStoreNames.contains(storeName)) {
        // 创建一个指定名称的对象存储空间,通过keyPath指定主键；第一个参数是名称 ,第二个参数是配置参数
        objectStore = db.createObjectStore(storeName, { keyPath: "key" });
        // objectStore.createIndex('name', 'name', { unique: true }) // 创建索引 可以让你搜索任意字段
      }
    };
  });
}

/**
 * 新增数据
 * @param db 数据库对象
 * @param storeName 表名（对象存储区）
 * @param data 存储的数据
 * @returns
 */
export function addData(db: any, storeName: any, data: any) {
  return new Promise((resolve, reject) => {
    let request = db
      .transaction([storeName], "readwrite") // 事务对象 指定表格名称和操作模式（"只读"或"读写"）
      .objectStore(storeName) // 仓库对象
      .add(data);

    request.onsuccess = function (event: any) {
      resolve(event);
    };

    request.onerror = function (event: any) {
      throw new Error(event.target.error);
      reject(event);
    };
  });
}

/**
 * 通过主键读取数据
 * @param db 数据库对象
 * @param storeName 表名（对象存储区）
 * @param key key
 * @returns
 */
export function getDataByKey(db: any, storeName: any, key: any) {
  return new Promise((resolve, reject) => {
    let transaction = db.transaction([storeName]); // 事务
    let objectStore = transaction.objectStore(storeName); // 仓库对象
    let request = objectStore.get(key);

    request.onerror = function (event: any) {
      reject(event);
    };

    request.onsuccess = function (event: any) {
      resolve(request.result);
    };
  });
}

/**
 * 通过游标读取数据（全部数据）
 * @param db 数据库对象
 * @param storeName 表名（对象存储区）
 * @returns
 */
export function cursorGetData(db: any, storeName: any) {
  let list: any = [];
  let store = db
    .transaction(storeName, "readwrite") // 事务
    .objectStore(storeName); // 仓库对象
  let request = store.openCursor(); // 指针对象
  return new Promise((resolve, reject) => {
    request.onsuccess = function (e: any) {
      let cursor = e.target.result;
      if (cursor) {
        // 必须要检查
        list.push(cursor.value);
        cursor.continue(); // 遍历了存储对象中的所有内容
      } else {
        resolve(list);
      }
    };
    request.onerror = function (e: any) {
      reject(e);
    };
  });
}

/**
 * 通过索引读取数据
 * @param db 数据库对象
 * @param storeName 表名（对象存储区）
 * @param indexName 索引名
 * @param indexValue 索引值
 * @returns 
 */
export function getDataByIndex(db: any, storeName: any, indexName: any, indexValue: any) {
  let store = db.transaction(storeName, "readwrite").objectStore(storeName);
  let request = store.index(indexName).get(indexValue);
  return new Promise((resolve, reject) => {
    request.onerror = function (e: any) {
      reject(e);
    };
    request.onsuccess = function (e: any) {
      resolve(e.target.result);
    };
  });
}

/**
 * 通过索引和游标查询记录
 * @param db 数据库对象
 * @param storeName 表名（对象存储区）
 * @param indexName 索引名
 * @param indexValue 索引值
 * @returns 
 */
export function cursorGetDataByIndex(db: any, storeName: any, indexName: any, indexValue: any) {
  let list: any = [];
  let store = db.transaction(storeName, "readwrite").objectStore(storeName); // 仓库对象
  let request = store
    .index(indexName) // 索引对象
    .openCursor(IDBKeyRange.only(indexValue)); // 指针对象
  return new Promise((resolve, reject) => {
    request.onsuccess = function (e: any) {
      let cursor = e.target.result;
      if (cursor) {
        list.push(cursor.value);
        cursor.continue(); // 遍历了存储对象中的所有内容
      } else {
        resolve(list);
      }
    };
    request.onerror = function (ev: any) {
      reject(ev);
    };
  });
}

/**
 * 更新数据（根据主键来更新，如果主键数据不存在则新建）
 * @param db 数据库对象
 * @param storeName 表名（对象存储区）
 * @param data 数据
 * @returns 
 */
export function updateDB(db: any, storeName: any, data: any) {
  let request = db
    .transaction([storeName], "readwrite") // 事务对象
    .objectStore(storeName) // 仓库对象
    .put(data);

  return new Promise((resolve, reject) => {
    request.onsuccess = function (ev: any) {
      resolve(ev);
    };

    request.onerror = function (ev: any) {
      resolve(ev);
    };
  });
}

/**
 * 删除数据
 * @param db 数据库对象
 * @param storeName 表名（对象存储区）
 * @param key 主键
 * @returns 
 */
export function deleteDB(db: any, storeName: any, key: any) {
  let request = db.transaction([storeName], "readwrite").objectStore(storeName).delete(key);

  return new Promise((resolve, reject) => {
    request.onsuccess = function (ev: any) {
      resolve(ev);
    };

    request.onerror = function (ev: any) {
      resolve(ev);
    };
  });
}

/**
 * 删除数据库
 * @param dbName 数据库名称
 * @returns 
 */
export function deleteDBAll(dbName: any) {
  console.log(dbName);
  let deleteRequest = window.indexedDB.deleteDatabase(dbName);
  return new Promise((resolve, reject) => {
    deleteRequest.onerror = function (event) {
      console.log("删除失败");
    };
    deleteRequest.onsuccess = function (event) {
      console.log("删除成功");
    };
  });
}

/**
 * 关闭数据库
 * @param db 数据库对象
 */
export function closeDB(db: any) {
  db.close();
  console.log("数据库已关闭");
}

export default {
  openDB,
  addData,
  getDataByKey,
  cursorGetData,
  getDataByIndex,
  cursorGetDataByIndex,
  updateDB,
  deleteDB,
  deleteDBAll,
  closeDB,
};

使用方法:

    const test1 = async () => {
      const db = await indexedDB.openDB("dbName","tableName");
      indexedDB.addData(db,"tableName",{key:"1",value:'2'})
    }