IDBFactory

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨2015年7月⁩.

* Some parts of this feature may have varying levels of support.

IndexedDB API 的IDBFactory 接口让程序可以异步存取 indexed databases。window.indexedDB 对象实现了这个接口。你可以通过这个对象而不是直接使用IDBFactory接口打开——创建或者连接——和删除一个数据库。

Methods

IDBFactory.open: 请求打开一个数据库的连接（connection to a database）。
IDBFactory.deleteDatabase: 请求删除数据库。
IDBFactory.cmp: 比较两个键的方法并返回一个结果，表明哪个值更大。

过时的 Methods

IDBFactory.open, the original version 已弃用: 一个被废弃的方法请求打开一个数据库的连接，仍然在一些浏览器中被实施 (connection to a database).

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 To-do Notifications app (view example live.)

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 = request.result; };