IDBRequest.error

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范例
规范
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error 只读特性在 IDBRequest interface returns the error in the event of an unsuccessful request.

注意： 此特征可用于 Web 工作者 .

句法

var myError = request.error;

值

A DOMError containing the relevant error. In Chrome 48+/Firefox 58+ this property returns a DOMException 因为 DOMError has been removed from the DOM standard. The following error codes are returned under certain conditions:

Error	解释
`AbortError`	If you abort the transaction, then all requests still in progress receive this error.
`ConstraintError`	If you insert data that doesn't conform to a constraint. It's an exception type for creating stores and indexes. You get this error, for example, if you try to add a new key that already exists in the record.
`QuotaExceededError`	If you run out of disk quota and the user declined to grant you more space.
`UnknownError`	If the operation failed for reasons unrelated to the database itself. A failure due to disk IO errors is such an example.
`NoError`	If the request succeeds.
`VersionError`	If you try to open a database with a version lower than the one it already has.

In addition to the error codes sent to the IDBRequest object, asynchronous operations can also raise exceptions. The list describes problems that could occur when the request is being executed, but you might also encounter other problems when the request is being made. For example, if the the request failed and the result is not available, the InvalidStateError exception is thrown.

范例

The following example requests a given record title, onsuccess gets the associated record from the IDBObjectStore (made available as objectStoreTitleRequest.result ), updates one property of the record, and then puts the updated record back into the object store. Also included at the bottom is an onerror function that reports what the error was if the request fails. For a full working example, see our 待办通知 app ( 实时查看范例 )。

var title = "Walk dog";
// Open up a transaction as usual
var objectStore = db.transaction(['toDoList'], "readwrite").objectStore('toDoList');
// Get the do-do list with the specified title
var objectStoreTitleRequest = objectStore.get(title);
objectStoreTitleRequest.onsuccess = function() {
  // Grab the data object returned as the result
  var data = objectStoreTitleRequest.result;
  // Update the notified value in the object to "yes"
  data.notified = "yes";
  // Create another request that inserts the item
  // back into the database
  var updateTitleRequest = objectStore.put(data);
  // When this new request succeeds, run the displayData()
  // function again to update the display
  updateTitleRequest.onsuccess = function() {
    displayData();
  };
};
objectStoreTitleRequest.onerror = function() {
  // If an error occurs with the request, log what it is
  console.log("There has been an error with retrieving your data: " + objectStoreTitleRequest.error);
};

规范

规范	状态	注释
索引数据库 API 2.0 The definition of 'error' in that specification.	推荐
索引数据库 API 草案 The definition of 'error' 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
`error`	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
`DOMException` value instead of `DOMError`	Chrome 48	Edge ≤18	Firefox 58	IE 不支持 No	Opera Yes	Safari 不支持 No	WebView Android 48	Chrome Android 48	Firefox Android 58	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android 5.0

图例

完整支持
部分支持
不支持
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
IDBRequest
特性
1. error
2. onerror
3. onsuccess
4. readyState
5. result
6. source
7. transaction
事件
1. error
继承：
1. EventTarget
IndexedDB 相关页面

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句法

值

范例

规范

浏览器兼容性

图例

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