如何在chrome扩展中使用IndexedDB？

let request = indexedDB.open('databaseName', 1); // 打开或创建名为'databaseName'的数据库，版本号为1

request.onupgradeneeded = function(event) {
  let db = event.target.result;
  let objectStore = db.createObjectStore('storeName', { keyPath: 'key' }); // 创建或更新名为'storeName'的对象存储空间，并指定键路径为'key'
};

request.onsuccess = function(event) {
  let db = event.target.result;
  let transaction = db.transaction('storeName', 'readwrite'); // 开启名为'storeName'的事务，并指定读写模式
  let objectStore = transaction.objectStore('storeName');

  // 添加数据
  let data = { key: 'value' };
  let addRequest = objectStore.add(data);

  // 删除数据
  let deleteRequest = objectStore.delete('key');

  // 修改数据
  let putRequest = objectStore.put(data);

  // 查询数据
  let getRequest = objectStore.get('key');
  getRequest.onsuccess = function(event) {
    let result = event.target.result;
    console.log(result);
  };

  transaction.oncomplete = function(event) {
    console.log('操作完成');
  };
};