IDBObjectStore.getKey()

在此页

句法
范例
规范
浏览器兼容性
另请参阅
相关话题

getKey() 方法在 IDBObjectStore interface returns an IDBRequest object, and, in a separate thread, returns the key selected by the specified query. This is for retrieving specific records from an object store.

If a key is successfully found, then a structured clone of it is created and set as the result of the request object.

注意： 此特征可用于 Web 工作者 .

句法

var request = objectStore.getKey(key);

参数

key

返回值

IDBRequest object on which subsequent events related to this operation are fired.

异常

此方法可能引发 DOMException of one of the following types:

异常	描述
`TransactionInactiveError`	This `IDBObjectStore` 's transaction is inactive.
`DataError`	The key or key range provided contains an invalid key.
`InvalidStateError`	`IDBObjectStore` has been deleted or removed.

范例

let openRequest = indexedDB.open("telemetry");
openRequest.onsuccess = (event) => {
  let db = event.target.result;
  let store = db.transaction("netlogs").objectStore("netlogs");
  let today = new Date();
  let yesterday = new Date(today);
  yesterday.setDate(today.getDate() - 1);
  let request = store.getKey(IDBKeyRange(yesterday, today));
  request.onsuccess = (event) => {
    let when = event.target.result;
    alert("The 1st activity in last 24 hours was occurred at " + when);
  };
};

规范

规范	状态	注释
索引数据库 API 草案 The definition of 'getKey()' in that specification.	推荐	初始定义

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`getKey`	Chrome 48	Edge ≤79	Firefox 51	IE ?	Opera 45	Safari 10.1	WebView Android 48	Chrome Android 48	Firefox Android 58	Opera Android 43	Safari iOS 10.3	Samsung Internet Android 5.0

图例

完整支持
兼容性未知 ?

另请参阅

使用 IndexedDB
开始事务： IDBDatabase
使用事务： IDBTransaction
设置一系列键： IDBKeyRange
检索并使您的数据改变： IDBObjectStore
使用光标： IDBCursor
参考范例：待办通知 ( 实时查看范例 )。

元数据

最后修改： 2019 年 3 月 23 日

IndexedDB API
IDBObjectStore
特性
方法
1. add()
2. clear()
3. count()
4. createIndex()
5. delete()
6. deleteIndex()
7. get()
8. getAll()
9. getAllKeys()
10. getKey()
11. index()
12. openCursor()
13. openKeyCursor()
14. put()
IndexedDB 相关页面

在此页

句法

参数

返回值

异常

范例

规范

浏览器兼容性

图例

另请参阅

相关话题