IDBFactory.open()

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句法
范例
规范
浏览器兼容性
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open() 方法在 IDBFactory interface requests opening a 连接到数据库 .

The method returns an IDBOpenDBRequest object immediately, and performs the open operation asynchronously. If the operation is successful, a success event is fired on the request object that is returned from this method, with its result attribute set to the new IDBDatabase object for the connection.

If an error occurs while the database connection is being opened, then an error event is fired on the request object returned from this method.

May trigger upgradeneeded , blocked or versionchange 事件。

注意： 此特征可用于 Web 工作者 .

句法

For the current standard:

var IDBOpenDBRequest = indexedDB.open(name);
var IDBOpenDBRequest = indexedDB.open(name, version);

参数

名称
version 可选: Optional. The version to open the database with. If the version is not provided and the database exists, then a connection to the database will be opened without changing its version. If the version is not provided and the database does not exist, then it will be created with version 1 .

Experimental Gecko options object

options (version and storage) 可选: In Gecko, since version 26 , you can include a non-standard 选项 object as a parameter of IDBFactory.open 包含 version number of the database, plus a storage value that specifies whether you want to use persistent or temporary storage. 警告： storage attribute is deprecated and will soon be removed from Gecko. You should use StorageManager.persist() to get persistent storage instead.

注意 : You can find out more information on the different available storage types, and how Firefox handles client-side data storage, at 浏览器存储限制和驱逐准则 .

返回值

A IDBOpenDBRequest object on which subsequent events related to this request are fired.

异常

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

异常	描述
`TypeError`	The value of version is zero or a negative number or not a number.

范例

Example of calling open with the current specification's version parameter:

var request = window.indexedDB.open("toDoList", 4);

In the following code snippet, we make a request to open a database, and include handlers for the success and error cases. For a full working example, see our 待办通知 app ( 实时查看范例 )。

var note = document.querySelector("ul");
// In the following line, you should include the prefixes
// of implementations you want to test.
window.indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
// DON'T use "var indexedDB = ..." if you're not in a function.
// Moreover, you may need references to some window.IDB* objects:
window.IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction || window.msIDBTransaction;
window.IDBKeyRange = window.IDBKeyRange || window.webkitIDBKeyRange || window.msIDBKeyRange;
// (Mozilla has never prefixed these objects, so we don't
//  need window.mozIDB*)
// Let us open version 4 of our database
var DBOpenRequest = window.indexedDB.open("toDoList", 4);
// these two event handlers act on the database being opened
// successfully, or not
DBOpenRequest.onerror = function(event) {
  note.innerHTML += '<li>Error loading database.</li>';
};
DBOpenRequest.onsuccess = function(event) {
  note.innerHTML += '<li>Database initialised.</li>';
  // store the result of opening the database in the db
  // variable. This is used a lot later on, for opening
  // transactions and suchlike.
  db = DBOpenRequest.result;
};

规范

规范	状态	注释
索引数据库 API 2.0 在该规范中的 open() 定义。	推荐
索引数据库 API 草案在该规范中的 open() 定义。	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
`open`	Chrome 24 24 23 — 24 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 ? — ? Prefixed Prefixed Implemented with the vendor prefix: webkit	Chrome Android 25	Firefox Android 22	Opera Android 14	Safari iOS 8	Samsung Internet Android 1.5

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
IDBFactory
方法
1. cmp()
2. databases
3. deleteDatabase()
4. open()
IndexedDB 相关页面

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句法

参数

Experimental Gecko options object

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