IDBObjectStore.openCursor()

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openCursor() 方法在 IDBObjectStore interface returns an IDBRequest object, and, in a separate thread, returns a new IDBCursorWithValue object. Used for iterating through an object store with a cursor.

To determine if the add operation has completed successfully, listen for the results’s success 事件。

注意： 此特征可用于 Web 工作者 .

句法

var request = ObjectStore.openCursor();
var request = ObjectStore.openCursor(query);
var request = ObjectStore.openCursor(query, direction);

参数

query 可选: A key or IDBKeyRange to be queried. If a single valid key is passed, this will default to a range containing only that key. If nothing is passed, this will default to a key range that selects all the records in this object store.
direction 可选: IDBCursorDirection telling the cursor what direction to travel. Valid values are "next" , "nextunique" , "prev" ，和 "prevunique" 。默认为 "next" .

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
`InvalidStateError`	This `IDBObjectStore` or `IDBIndex` has been deleted.
`TransactionInactiveError`	This `IDBObjectStore` 's transaction is inactive.
`DataError`	The specified key or key range is invalid.

范例

In this simple fragment we create a transaction, retrieve an object store, then use a cursor to iterate through all the records in the object store:

var transaction = db.transaction("name", "readonly");
var objectStore = transaction.objectStore("name");
var request = objectStore.openCursor();
request.onsuccess = function(event) {
  var cursor = event.target.result;
  if(cursor) {
    // cursor.value contains the current record being iterated through
    // this is where you'd do something with the result
    cursor.continue();
  } else {
    // no more results
  }
};

规范

规范	状态	注释
索引数据库 API 2.0 The definition of 'openCursor()' in that specification.	推荐
索引数据库 API 草案 The definition of 'openCursor()' in that specification.	推荐

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
`openCursor`	Chrome 24 24 23 — 57 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox 16 16 10 — 16 Prefixed Prefixed Implemented with the vendor prefix: moz	IE 部分支持 10	Opera 15	Safari 7	WebView Android Yes Yes ? — 57 Prefixed Prefixed Implemented with the vendor prefix: webkit	Chrome Android 25 25 25 — 57 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 22	Opera Android 14	Safari iOS 8	Samsung Internet Android 1.5 1.5 1.5 — 7.0 Prefixed Prefixed Implemented with the vendor prefix: webkit

图例

完整支持
部分支持
要求使用供应商前缀或不同名称。

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： 2020 年 1 月 22 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

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